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Compression Fittings
For Use With Copper Or Plastic Tubing

These hard-to-find quality brass compression fittings are standard stock items at our warehouse. Whether you need 1 or 1000 (or even more!), there is never a minimum quantity requirement to order fittings of any kind from PlumbingSupply.com®. Click here for compression fitting installation instructions.


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

Please note: Not all fitting styles available in all sizes. Brass compression fittings on this page are NOT for use with potable water.

Can't find what you're looking for? We offer an extensive selection of compression fittings for potable/drinking water in many more sizes and styles.

Prop 65 warning
California Proposition 65 Warning
WARNING: These products contain lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, click here.
(California law requires this warning to be given to customers in the State of California.)

Items with lead are NOT for use in potable water systems and are only for industrial non-drinking water applications

Brass Compression Unions / Couplers / Couplings

Brass Compression Union
Union Size Price & Quantity
1/4" OD x 3/16" OD $5.98
Union Size Price & Quantity
5/8" OD $7.19

If you don't see the size you're looking for here, try our selection of Compression Unions/Couplers for use with potable/drinking water.

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Brass Compression 90° Elbows

Brass Compression 90deg Elbow
Fitting Size Price & Quantity
1/8" OD $6.33
Fitting Size Price & Quantity
3/16" OD $4.99

If you don't see the size you're looking for here, try our selection of 90° Compression Elbows for use with potable/drinking water.

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Brass Compression x MIPS 90° Elbows

Brass Compression x MIPS 90deg Elbow
Size Price & Quantity
1/4" OD x 3/8" Mips $3.69
3/8" OD x 1/4" Mips $2.93
3/8" OD x 3/8" Mips $2.44
Size Price & Quantity
3/8" OD x 1/2" Mips $3.17
7/16" OD x 1/4" Mips $5.95

If you don't see the size you're looking for here, try our selection of Compression Elbows for use with potable/drinking water.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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
1/8" OD x 1/8" FIPS $5.82
1/4" OD x 1/4" FIPS $4.76
Size Price & Quantity
5/16" OD x 1/8" FIPS $5.25

If you don't see the size you're looking for here, try our selection of Compression Elbows for use with potable/drinking water.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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
3/16" OD x 3/16" OD x 1/8" MIPS $3.96
1/4" OD $5.39
1/4" OD x 1/4" OD x 1/8" MIPS $5.64
Tee Size   (A x B x C) Price & Quantity
1/4" OD x 1/4" MIPS x 1/4" OD $6.69
1/4" OD x 1/8" MIPS x 1/4" OD $3.92
1/4" OD x 1/4" OD x 1/4" MIPS $6.27

If you don't see the size you're looking for here, try our selection of Compression Tees for use with potable/drinking water.

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Brass Compression x FIPS Adapter

Brass Compression x FIPS Adapter
Size Price & Quantity
1/8" OD Comp x 1/8" Fips $3.19
3/16" OD Comp x 1/8" FIPS $4.09
3/16" OD Comp x 1/4" FIPS $7.26
1/4" OD Comp x 1/8" Fips $2.79
Size Price & Quantity
1/4" OD Comp x 3/8" Fips $3.35
3/8" OD Comp x 1/4" Fips $2.89
3/8" OD Comp x 1/2" Fips $3.59
3/4" OD Comp x 3/4" Fips $14.97

If you don't see the size you're looking for here, try our selection of Compression FIPS Adapters for use with potable/drinking water.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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Brass Compression x MIPS Adapter

Brass Compression x MIPS Adapter
Size Price & Quantity
1/4" OD Comp x 1/2" Mips $2.47
3/8" OD Comp x 3/4" Mips $4.05
Size Price & Quantity
7/16" OD Comp x 3/8" Mips $7.27
7/8" OD Comp x 1" Mips $15.39

If you don't see the size you're looking for here, try our selection of Compression MIPS Adapters for use with potable/drinking water.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

Brass Compression Sleeves
A.K.A Ferrules

Brass Compression Sleeve
Size Price & Quantity
1/8" OD $0.26
3/16" OD $0.25
5/16" OD $0.26
Size Price & Quantity
7/16" OD $0.57
5/8" OD $0.47
3/4" OD $1.25

If you don't see the size you're looking for here, try our selection of Compression Sleeves for use with potable/drinking water.

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Brass Compression Nuts

Brass Compression Nut
Size Price & Quantity
1/8" OD $0.57
3/16" OD $0.47
1/4" OD $0.44
5/16" OD $0.61
3/8" OD $0.79
Size Price & Quantity
7/16" OD $1.34
1/2" OD $1.62
5/8" OD $1.77
3/4" OD $2.29
7/8" OD $3.21


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Brass Inserts For Plastic Tubing

Brass Compression Insert
Brass Insert Fits Plastic Tube Size Price & Quantity
5/8" 5/8" OD x 1/2" ID $1.05

If you don't see the size you're looking for here, try our selection of Brass Inserts for use with potable/drinking water.

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Plastic Sleeves For Plastic Tubing

Plastic Sleeve
Plastic Sleeves Price & Quantity
1/4" OD $0.28
5/16" OD $0.69
3/8" OD $0.44
Plastic Sleeves Price & Quantity
1/2" OD $0.45
5/8" OD $0.53

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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 $13.73

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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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 $3.95

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Brass Needle Valve - Angled - Comp x Mips
This item can be used for potable/drinking water

Angled Brass Needle Valve
Size Price & Quantity
1/4" OD Comp x 1/8" Mips $10.24

We offer many more needle valves here.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

Brass Needle Valve - Straight - Comp x Mips

Straight Brass Needle Valve
Valve Size Price & Quantity
3/16" OD Comp x 1/8" Mips $21.28
1/4" OD Comp x 1/8" Mips $9.48
Valve Size Price & Quantity
5/16" OD Comp x 1/8" Mips $25.92

We offer many more needle valves here.

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

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Self-Piercing Brass Needle Valve Kit

Self-Piercing Needle Valve

An easy way to add water to refrigerators for icemakers, reverse osmosis systems, humidifiers, swamp coolers, patio misters, pet water dispensers and many other uses without a lot of work or cost.

Saddle clamp fits 3/8" OD thru 3/4" OD piping. Kit includes 1/4" OD brass sleeve for copper tube installation to outlet and 1/4" OD plastic delrin sleeve and brass insert for plastic tube installation to outlet. These self tapping needle valve kits are usually self piercing when used on copper tubing but we recommend drilling a small hole in the pipe first.


Size Price & Quantity
3/8" Kit - 3/4" OD inlet   x   1/4" OD Comp outlet $7.99

Limited to stock while supplies last

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Shop Compression Fittings by Size

1/8" Compression Fittings

Description Price & Quantity
1/8" OD Sleeve (ferrule) $0.26
1/8" OD Nut $0.57
1/8" OD 90° Elbow $6.33
1/8" OD x 1/8" FIPS 90° Elbow $5.82
1/8" OD x 1/8" FIPS Adapter $3.19

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3/16" Compression Fittings

Description Price & Quantity
3/16" OD Sleeve (ferrule) $0.25
3/16" OD Nut $0.47
3/16" OD x 3/16" OD x 1/8" MIPS Reducing Tee $3.96
3/16" OD 90° Elbow $4.99
3/16" OD x 1/8" FIPS Adapter $4.09
3/16" OD x 1/4" FIPS Adapter $7.26

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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" OD Nut $0.44
1/4" OD Nut with captive sleeve $0.99
1/4" OD x 3/16" OD Reducing Union $5.98
1/4" OD Tee $5.39
1/4" OD x 1/4" OD x 1/8" MIPS Reducing Tee $5.64
1/4" OD x 1/4" MIPS x 1/4" OD Tee $6.69
1/4" OD x 1/8" MIPS x 1/4" OD Reducing Tee $3.92
1/4" OD x 1/4" OD x 1/4" MIPS Tee $6.27
Description Price & Quantity
1/4" OD x 1/4" FIPS 90° Elbow $4.76
1/4" OD x 3/8" MIPS 90° Elbow $3.69
1/4" OD x 1/8" FIPS Adapter $2.79
1/4" OD x 3/8" FIPS Adapter $3.35
1/4" OD x 1/2" MIPS Adapter $2.47
1/4" OD Plastic Sleeve $0.28
1/4" Female Comp. x 1/4" Male comp. 90 $3.95

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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" OD Sleeve (ferrule) $0.26
5/16" OD Nut $0.61
Description Price & Quantity
5/16" OD x 1/8" FIPS 90° Elbow $5.25
5/16" OD Plastic Sleeve $0.69

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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" OD Nut $0.79
3/8" OD x 1/4" MIPS 90° Elbow $2.93
3/8" OD x 3/8" MIPS 90° Elbow $2.44
3/8" OD x 1/2" MIPS 90° Elbow $3.17
Description Price & Quantity
3/8" OD x 1/4" FIPS Adapter $2.89
3/8" OD x 1/2" FIPS Adapter $3.59
3/8" OD x 3/4" MIPS Adapter $4.05
3/8" OD Plastic Sleeve $0.44

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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" OD Sleeve (ferrule) $0.57
7/16" OD Nut $1.34
7/16" OD x 1/4" MIPS Adapter $5.95
7/16" OD x 3/8" MIPS Adapter $7.27

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

1/2" Compression Fittings

Description Price & Quantity
1/2" OD Nut $1.62
1/2" OD Plastic Sleeve $0.45

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
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" OD Sleeve (ferrule) $0.47
5/8" OD Nut $1.77
5/8" OD Union/Coupler $7.19
Description Price & Quantity
5/8" OD x 6" long Repair Coupling $13.73
5/8" OD Plastic Sleeve $0.53
5/8" OD Brass Insert - for 1/2" ID tubing $1.05

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

3/4" Compression Fittings

Description Price & Quantity
3/4" OD Sleeve (ferrule) $1.25
3/4" OD Nut $2.29
3/4" OD x 3/4" FIPS Adapter $14.97

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) - $0.69 or (1/2" x 520" roll) - $0.89
GRAY 4 Mil (thicker) PTFE Tape (1/2" x 260" roll) - $2.29
Great White Basic Pipe Joint Compound (1 oz.) - $2.78
High Quality TU-555 Pipe Joint Compound (4 oz.) - $7.08
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.

- OR - View Cart

7/8" Compression Fittings

Description Price & Quantity
7/8" OD Nut $3.21
7/8" OD Comp x 1" Mips Adapter $15.39

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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.

Frequently Asked Questions

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.

View video tutorial
Compression Fittings

Compression Fittings video

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. "I have clear vinyl tubing, can I use these compression fittings with it?"
A. These 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 and the inside diameter of the plastic tubing to be used. 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 while still allowing the plastic sleeve and compression nut to slide over the outside of the plastic tubing.

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.

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.


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