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Brass Compression Fittings

These pipe fittings are compliant with the 2014 Federal Safe Drinking Water Act

Drinking water safe fittings are gaining in popularity as homeowners are updating or remodeling their kitchens, and new construction is also taking notice. Containing less than 0.25% lead (weighted average) - these ANSI Certified compression fittings are designed for use with potable water and can easily replace old standard brass fittings, plus they provide a healthier alternative for your family. Let PlumbingSupply.com® be your source for these and many other potable/drinking water products.


Fitting sizes shown are determined by the outside diameter (OD) of the pipe to be used.

Learn more about compression fittings, including how to choose the right size and when to use them

Please note: Not all fitting styles available in all sizes. All brass products on this page are compliant with 2014 Federal Safe Drinking Water Act standards.

Brass Compression Unions

Brass Compression Union
Size Price & Quantity
1/8" x 1/8" OD $3.72
3/16" x 3/16" OD $4.38
1/4" x 3/16" OD $5.98
1/4" x 1/4" OD $2.92
5/16" x 1/4" OD $5.57
5/16" x 5/16" OD $6.05
3/8" x 1/4" OD $3.71
3/8" x 3/8" OD $4.14
Size Price & Quantity
7/16" x 7/16" OD $9.67
1/2" x 3/8" OD $5.37
1/2" x 1/2" OD $5.80
5/8" x 3/8" OD $5.98
5/8" x 1/2" OD $6.83
5/8" x 5/8" OD $6.99
7/8" x 7/8" OD $14.49

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Unsure what size compression fitting you need? Find help with our Compression Sizing Chart

Brass Compression 90° Elbows

Brass Compression 90deg Elbow
Size Price & Quantity
1/4" OD $3.38
3/8" OD $4.44
Size Price & Quantity
1/2" OD $7.45
5/8" OD $10.21

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Pricing discounts will show up in your shopping cart.

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Brass Compression x MIPS 90° Elbows

Brass Compression x MIPS 90deg Elbow
Size Price & Quantity
1/4" x 1/8" MIPS $2.78
1/4" x 1/4" MIPS $3.24
1/4" x 3/8" MIPS $5.06
3/8" x 1/8" MIPS $7.66
3/8" x 1/4" MIPS $3.61
Size Price & Quantity
3/8" x 3/8" MIPS $4.43
3/8" x 1/2" MIPS $5.94
1/2" x 3/8" MIPS $5.62
1/2" x 1/2" MIPS $6.78
5/8" x 1/2" MIPS $7.86

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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Brass Compression x FIPS 90° Elbows

Brass Compression x FIPS 90deg Elbow
Size Price & Quantity
1/4" x 1/8" FIPS $7.89
1/4" x 1/4" FIPS $10.38
1/4" x 3/8" FIPS $9.01
3/8" x 1/4" FIPS $10.25
3/8" x 3/8" FIPS $12.94
Size Price & Quantity
3/8" x 1/2" FIPS $6.02
1/2" x 3/8" FIPS $11.21
1/2" x 1/2" FIPS $13.84
5/8" x 1/2" FIPS $7.83

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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Brass Compression Tees

Brass Compression Tee
Tee Size   (A x B x C) Price & Quantity
1/8" OD $4.97
3/16" OD $6.28
1/4" OD $4.57
3/8" OD $6.48
Tee Size   (A x B x C) Price & Quantity
3/8" OD x 3/8" OD x 1/4" OD $8.77
1/2" OD $10.61
5/8" OD $13.58

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Unsure what size compression fitting you need? Find help with our Compression Sizing Chart

Brass Compression x FIPS Adapter

Brass Compression x FIPS Adapter
Size Price & Quantity
1/4" x 1/4" FIPS $3.66
1/4" x 3/8" FIPS $5.22
1/4" x 1/2" FIPS $5.72
3/8" x 1/8" FIPS $6.01
3/8" x 3/8" FIPS $3.42
3/8" x 1/2" FIPS $3.67
Size Price & Quantity
1/2" x 3/8" FIPS $4.12
1/2" x 1/2" FIPS $4.70
1/2" x 3/4" FIPS $9.59
5/8" x 1/2" FIPS $5.02
5/8" x 3/4" FIPS $7.43
7/8" x 3/4" FIPS $10.68

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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Chrome Female Compression x O.D. Compression Reducer (unique)
Special Female compression x O.D. compression (includes washer to seal female connection)

Female Compression x Compression Reducer Adapter
Size Price & Quantity
1/2" OD Female Comp x 3/8" OD Comp Reducer (Chrome) $5.49

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Brass Female Compression x O.D. Compression Reducer (unique)
Special Female compression x O.D. compression (includes washer to seal female connection)

Female compression size shown in table refers to the outside diameter of the tubing to be used. Example: 1/4" Female compression fits 1/4" compression fitting for 1/4" outside diameter tubing

Unsure what size compression fitting you need? Find help with our Compression Sizing Chart

Unique Female x Outside Diameter Compression Reducer

Size Price & Quantity
1/4" x 3/8" OD. Compression $1.82
3/8" Female Compression x 1/4" OD. Compression $3.90
3/8" Female Compression x 1/2" OD. Compression $2.93
Washer ONLY for 1/4" Female Compression $0.73
Washer ONLY for 3/8" Female Compression $0.73
Washer ONLY for 1/2" Female Compression $0.56

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Brass Compression x MIPS Adapter

Brass Compression x MIPS Adapter
Size Price & Quantity
1/8" x 1/8" MIPS $2.63
3/16" x 1/4" MIPS $4.79
1/4" x 1/8" MIPS $2.13
1/4" x 1/4" MIPS $2.56
1/4" x 3/8" MIPS $3.33
1/4" x 1/2" MIPS $4.85
5/16" x 1/4" MIPS $5.33
3/8" x 1/8" MIPS $4.79
3/8" x 1/4" MIPS $2.97
3/8" x 3/8" MIPS $3.47
Size Price & Quantity
3/8" x 1/2" MIPS $4.88
1/2" x 3/8" MIPS $4.10
1/2" x 1/2" MIPS $5.62
1/2" x 3/4" MIPS $7.26
3/4" x 3/4" MIPS $16.94
5/8" x 1/2" MIPS $5.90
5/8" x 3/4" MIPS $6.91
7/8" x 1/2" MIPS $10.70
7/8" x 3/4" MIPS $10.67

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

Brass Compression Caps

Brass Compression Cap
Size Price & Quantity
1/4" OD $0.68
3/8" OD $0.88
Size Price & Quantity
1/2" OD $2.32
5/8" OD $2.91

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Unsure what size compression fitting you need? Find help with our Compression Sizing Chart

Brass Compression Sleeves
A.K.A Ferrules

Brass Compression Sleeve
Size Price & Quantity
1/8" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.30
3/16" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.29
1/4" OD $0.17
5/16" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.30
3/8" OD $0.28
Size Price & Quantity
7/16" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.66
1/2" OD $0.32
5/8" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.54
3/4" OD - NOT Compliant with 2014 Federal Safe Drinking Water Act $1.44
7/8" OD $1.00

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Brass Compression Nuts

Brass Compression Nut
Size Price & Quantity
1/8" OD $0.65
3/16" OD $0.54
1/4" OD $0.51
5/16" OD $0.70
3/8" OD $0.91
Size Price & Quantity
7/16" OD $1.54
1/2" OD $1.86
5/8" OD $2.03
3/4" OD $2.62
7/8" OD $3.60


Order 10, 25, 50 or more of the same item for additional savings!
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Brass Inserts For Plastic Tubing

Brass Compression Insert
Brass Insert Fits Plastic Tube Size Price & Quantity
1/4" 1/4" OD x 0.170" ID $0.22
5/16" 5/16" OD x 0.187" ID $0.24
3/8" 3/8" OD x 1/4" ID $0.22
Brass Insert Fits Plastic Tube Size Price & Quantity
1/2" 1/2" OD x 3/8" ID $0.31
5/8" 5/8" OD x 1/2" ID $0.54

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Plastic Sleeves For Plastic Tubing

Plastic Sleeve
Plastic Sleeves Price & Quantity
1/4" OD $0.32
5/16" OD $0.79
3/8" OD $0.51
Plastic Sleeves Price & Quantity
1/2" OD $0.52
5/8" OD $0.61

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Brass & Copper Repair Coupling (unique)

Repair Coupling
Repair Coupling size Price & Quantity
5/8" compression - fits over 1/2" CTS - 6" length $14.90

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SPECIAL Female Compression x Male Compression 90° Elbow

Female Comp x Male Comp 90
Size Price & Quantity
1/4" Female Comp x 1/4" Male Comp $4.42

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Quick Tee Adapters
Create a branch outlet on a supply stop without shutting off the main water supply


Adapter
Features:
  • Durable brass construction
  • Great for hot or cold water lines
  • Ideal for ice makers, dishwashers, & water filter faucets
  • Swivel screw on hook-up means no drilling or extra valves are needed
  • Purchase extra adapters to connect multiple accessories
  • Available in a variety of sizes to fit your valve and application
  • These adapters are 2014 Federal Safe Drinking Water Act compliant
Before the quick tee adapterBEFORE The Quick Tee Adapter
InstalledThe Quick Tee Installed
AfterAFTER Quick Tee Adapter Installed

Quick Tee Adapter #933-015NL#993-015NL
Quick Tee Adapter #933-016NL#993-016NL
Quick Tee Adapter #933-018NL#993-018NL

Quick Tee Adapter #933-019NL#993-019NL
Quick Tee Adapter #933-020NL#993-020NL

Model # Brass Quick Tee Adapters - Size A x Size B x Size C Price & Quantity
993-015NL 3/8" female compression x 3/8" male compression x 1/4" male compression $7.86
993-016NL 3/8" female compression x 3/8" male compression x 3/8" male compression $7.88
993-018NL 1/2" female compression x 1/2" male compression x 3/8" male compression $9.02
993-019NL 1/2" female IPS slip joint x 1/2" male IPS slip joint x 1/4" male compression $8.49
993-020NL 1/2" female IPS slip joint x 1/2" male IPS slip joint x 3/8" male compression $9.77

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

Add-A-Line - Tee with Valve

Add a water line for dishwashers, ice makers, humidifiers, or any fixture needing a water line.
Reliable brass ball valve provides durable alternative to saddle valves.

example of Add-A-Line compression tee with valve

Add-A-Line Tee Size Price & Quantity
5/8" OD x 1/4" OD outlet $26.63
5/8" OD x 3/8" OD outlet $28.89
7/8" OD x 1/4" OD outlet $33.84

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Shop Brass Compression Fittings by Size

1/8" Compression Fittings

Description Price & Quantity
1/8" OD x 1/8" OD Union $3.72
1/8" OD Tee $4.97
1/8" OD x 1/8" MIPS Adapter $2.63
Description Price & Quantity
1/8" OD Sleeve - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.30
1/8" OD Nut $0.65

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

3/16" Compression Fittings

Description Price & Quantity
3/16" x 3/16" OD Union $4.38
3/16" x 1/4" MIPS Adapter $4.79
3/16" OD Sleeve NOT Compliant with 2014 Federal Safe Drinking Water Act $0.29
Description Price & Quantity
3/16" OD Nut $0.54
3/16" OD Tee $6.28

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

1/4" Compression Fittings

Description Price & Quantity
1/4" x 3/16" OD Reducing Union $5.98
1/4" x 1/4" OD Union $2.92
1/4" OD 90° Elbow $3.38
1/4" OD x 1/8" MIPS 90° Elbow $2.78
1/4" OD x 1/4" MIPS 90° Elbow $3.24
1/4" OD x 3/8" MIPS 90° Elbow $5.06
1/4" x 1/8" FIPS 90° Elbow $7.89
1/4" x 1/4" FIPS 90° Elbow $10.38
1/4" x 3/8" FIPS 90° Elbow $9.01
1/4" Female Comp. x 1/4" Male Comp. 90 $4.42
1/4" OD Tee $4.57
1/4" OD x 1/8" FIPS Adapter $3.33
1/4" OD x 1/4" FIPS Adapter $3.66
Description Price & Quantity
1/4" OD x 3/8" FIPS Adapter $5.22
1/4" OD x 1/2" FIPS Adapter $5.72
1/4" OD x 1/8" MIPS Adapter $2.13
1/4" OD x 1/4" MIPS Adapter $2.56
1/4" OD x 3/8" MIPS Adapter $3.33
1/4" OD x 1/2" MIPS Adapter $4.85
1/4" OD. x 3/8" Female Compression $3.90
1/4" OD Cap $0.68
1/4" OD Sleeve $0.17
1/4" OD Nut $0.51
1/4" OD Plastic Sleeve $0.32
1/4" OD Brass Insert - for 0.170" ID tubing $0.22

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

5/16" Compression Fittings

Description Price & Quantity
5/16" x 1/4" OD Union $5.57
5/16" x 5/16" OD Union $6.05
5/16" OD x 1/4" MIPS Adapter $5.33
5/16" OD Sleeve - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.30
Description Price & Quantity
5/16" OD Nut $0.70
5/16" OD Plastic Sleeve $0.79
5/16" OD Brass Insert - for 0.187" ID tubing $0.24

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

3/8" Compression Fittings

Description Price & Quantity
3/8" x 1/4" OD Union $3.71
3/8" x 3/8" OD Union $4.14
3/8" x 1/2" OD Union $5.37
3/8" OD 90° Elbow $4.44
3/8" OD x 1/8" MIPS 90° Elbow $7.66
3/8" OD x 1/4" MIPS 90° Elbow $3.61
3/8" OD x 3/8" MIPS 90° Elbow $4.43
3/8" OD x 1/2" MIPS 90° Elbow $5.94
3/8" x 1/4" FIPS 90° Elbow $10.25
3/8" x 3/8" FIPS 90° Elbow $12.94
3/8" x 1/2" FIPS 90° Elbow $6.02
3/8" OD Tee $6.48
3/8" OD x 3/8" OD x 1/4" OD Tee $8.77
3/8" OD x 1/8" FIPS Adapter $6.01
Description Price & Quantity
3/8" OD x 3/8" FIPS Adapter $3.42
3/8" OD x 1/2" FIPS Adapter $3.67
3/8" OD x 1/8" MIPS Adapter $4.79
3/8" OD x 1/4" MIPS Adapter $2.97
3/8" OD x 3/8" MIPS Adapter $3.47
3/8" OD x 1/2" MIPS Adapter $4.88
3/8" OD. x 1/4" Female Compression w/washer $1.82
3/8" OD. x 1/2" Female Compression w/washer $4.04
3/8" OD Cap $0.88
3/8" OD Sleeve $0.28
3/8" OD Nut $0.91
3/8" OD Plastic Sleeve $0.51
3/8" OD Brass Insert - for 1/4" ID tubing $0.22

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

7/16" Compression Fittings

Description Price & Quantity
7/16" x 7/16" OD Union $9.67
7/16" OD Sleeve - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.66
7/16" OD Nut $1.54

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

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Unsure what size compression fitting you need? Find help with our Compression Sizing Chart

1/2" Compression Fittings

Description Price & Quantity
1/2" x 1/2" OD Union $5.80
1/2" x 5/8" OD Union $6.83
1/2" OD 90° Elbow $7.45
1/2" OD x 3/8" MIPS 90° Elbow $5.62
1/2" OD x 1/2" MIPS 90° Elbow $6.78
1/2" x 3/8" FIPS 90° Elbow $11.21
1/2" x 1/2" FIPS 90° Elbow $13.84
1/2" OD Tee $10.61
1/2" OD x 3/8" FIPS Adapter $4.12
1/2" OD x 1/2" FIPS Adapter $4.70
1/2" OD x 3/4" FIPS Adapter $9.59
Description Price & Quantity
1/2" Female Comp x 3/8" OD Comp Compression Reducer - Chrome $5.49
1/2" OD x 3/8" MIPS Adapter $4.10
1/2" OD x 1/2" MIPS Adapter $5.62
1/2" OD x 3/4" MIPS Adapter $7.26
1/2" OD. x 3/8" Female Compression w/washer $2.93
1/2" OD Cap $2.32
1/2" OD Sleeve $0.32
1/2" OD Nut $1.86
1/2" OD Plastic Sleeve $0.52
1/2" OD Brass Insert - for 3/8" ID tubing $0.31

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

5/8" Compression Fittings

Description Price & Quantity
5/8" x 3/8" OD Union $5.98
5/8" x 5/8" OD Union $6.99
5/8" OD 90° Elbow $10.21
5/8" OD x 1/2" MIPS 90° Elbow $7.86
5/8" x 1/2" FIPS 90° Elbow $7.83
5/8" OD Tee $13.58
5/8" OD x 1/2" FIPS Adapter $5.02
5/8" OD x 3/4" FIPS Adapter $7.43
Description Price & Quantity
5/8" OD x 1/2" MIPS Adapter $5.90
5/8" OD x 3/4" MIPS Adapter $6.91
5/8" OD Cap $2.91
5/8" OD Sleeve - NOT Compliant with 2014 Federal Safe Drinking Water Act $0.54
5/8" OD Nut $2.03
5/8" OD Plastic Sleeve $0.61
5/8" OD Brass Insert - for 1/2" ID tubing $0.54
5/8" OD x 6" long Repair Coupling $14.90

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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3/4" Compression Fittings

Description Price & Quantity
3/4" OD Sleeve - NOT Compliant with 2014 Federal Safe Drinking Water Act $1.44
3/4" OD Nut $2.62
3/4" x 3/4" MIPS Adapter $16.94

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7/8" Compression Fittings

Description Price & Quantity
7/8" x 7/8" OD Union $14.49
7/8" OD x 3/4" FIPS Adapter $10.68
7/8" OD x 1/2" MIPS Adapter $10.70
Description Price & Quantity
7/8" OD x 3/4" MIPS Adapter $10.67
7/8" OD Sleeve $1.00
7/8" OD Nut $3.60

Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Need to seal your IPS pipe threads? We've got you covered.
Please Note: We do NOT recommend using thread sealants on your compression threads.
PTFE Tape (1/2" x 260" roll) - $0.77 or (1/2" x 520" roll) - $0.98
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.53
Great White Basic Pipe Joint Compound (1 oz.) - $3.04
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.76
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

Compression Fittings Related Items



Compression Fitting Sample For Plastic Tubing
clear vinyl tubing used for demonstration purposes

Example of choosing the correct brass insert and plastic sleeve to fit plastic tubingThe size of the plastic sleeve and the brass insert must be chosen according to the outside diameter dimension of the plastic tubing to be used.
Example of choosing the correct brass insert and plastic sleeve to fit plastic tubingWhen using plastic tubing, the "plastic sleeve" must be used and the "brass insert" must be used.
Example of brass insert, plastic sleeve and compression fitting properly assembled to plastic tubingThe plastic sleeve is used to seal against the outside of the plastic tubing and the tapered end will seal into the compression fitting. The brass insert is used to keep the inside of the plastic tubing from collapsing as the compression fitting is tightened.

compression male thread example with coupling and copper pipe
Conversion Chart For Male Compression Threads TO OD Compression Fitting Size
Fitting Size
(O.D. of Pipe)
Male Thread Size
(O.D.)
Threads Per
Inch
Fitting Size
(O.D. of Pipe)
Male Thread Size
(O.D.)
Threads Per
Inch
1/8" 5/16" 24 3/16" 3/8" 24
1/4" 7/16" 24 5/16" 1/2" 24
3/8" 9/16" 24 7/16" 5/8" 24
1/2" 11/16" 20 5/8" 13/16" 18
3/4" 1" 18 7/8" 1-1/8" 18


Frequently Asked Questions

Q. "How will I know which size compression fittings to use for my copper tubing?"
A. You will need to measure the outside diameter of your copper tubing. Whatever the outside diameter of your copper tubing is will be the size of the compression fitting you will need. For instance, if the outside diameter of your copper tubing is 1/4" then the compression fitting will need to be 1/4". Compression fittings are not sized like copper sweat fittings.

Q. "Should I use PTFE thread sealing tape or pipe joint compound on my compression threads?"
A. No, you definitely should not. PTFE tape and pipe joint compound (also known as "pipe dope") should only be used on "IPS" ("iron pipe size") threads, which are normal pipe threads. IPS threads make their seal along the threads themselves; when a piece of IPS-threaded pipe is screwed into a fitting, PTFE tape and/or pipe dope is used to assist that seal on the threads. Compression fittings, on the other hand, seal between the beveled end of the ferrule/sleeve and the beveled female part of the fitting, and so using pipe dope or tape on compression threads could actually prevent the fittings from making an adequate seal.

Q. "I have clear vinyl tubing, can I use these compression fittings with it?"
A. Brass compression fittings will work on some sizes of clear vinyl tubing and most sizes of low density polyethylene tubing. However, it really depends on the outside diameter and the inside diameter of the plastic tubing. When using plastic tubing, the "plastic sleeve" must be used and the "brass insert" must be used. The plastic sleeve is used to seal against the outside of the plastic tubing and the tapered end will seal into the compression fitting. Plastic sleeves are used because the brass compression sleeves can more easily cut into the plastic tubing, potentially causing a leak. The brass insert is used to keep the inside of the plastic tubing from collapsing as the compression fitting is tightened. The size of the plastic sleeve and the brass insert must be chosen according to the outside diameter dimension of the plastic tubing to be used. The brass insert must be able to fit snugly inside the plastic tubing yet still allow the plastic sleeve and compression nut to slide over the outside of the plastic tubing.

Q. "Why do you NOT recommend using thread sealants on compression threads?"
A. The use of a thread sealant on compression threads will prevent the compression nut from being tightened as far down as it will need to be to prevent a leak.

Q. "How does a compression fitting work to seal water?"
A. The compression nut is tightened clockwise to cause the compression sleeve to be squeezed between the fitting and the nut. As more pressure is applied to the nut, the ends of both sides of the sleeve dig slightly into the pipe on both sides of the sleeve, causing the sleeve to be compressed on to the tubing. The water seal takes place as the outside of the sleeve comes into contact with the inside of the nut, and at the same time, on the inside of the fitting on the other side, The sleeve is effectively sealed on both sides when it is properly squeezed between the nut and the fitting and compressed onto the tubing. Please note that over tightening the nut will cause a leak.

Q. "What is the difference between 'nominal' dimensions and 'outside diameter (OD)' dimensions?"
A. Nominal is the term used to describe most pipe and fitting measurements in the plumbing industry. Nominal refers to the inside diameter measurement of the pipe. The actual inside pipe measurements will vary slightly due to the wall thickness of the pipe, so it is referred to as "nominal" meaning a small variance of size. The outside diameter (OD) dimensions refer to the actual outside diameter of the pipe. The outside diameter dimensions of pipe are a constant size which allow pipe fittings to be used with the same type of piping with multiple grades of wall thickness.


A quick note about copper and lead...

If your home has copper water piping and those pipes were installed before 1986, your copper pipe/fittings were generally joined or soldered together with "50/50" solder. 50/50 solder was comprised of 50% lead and 50% tin and had been used by the majority of plumbers to join copper pipe and fittings for many decades. For homes that have 50/50 solder in their water piping we recommend that you install and use a lead removal filter for your drinking water. Lead has been determined to have significant negative impacts on health, especially for children, and there is no safe level determined for human consumption.

For more information about what lead free laws mean for you and frequently asked questions about lead in plumbing, click here.


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