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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.

Brass compression nut Compression brass tee Brass compression elbow Compression adapter Brass compression insert

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 lead free compression fittings in many more sizes and styles.

Prop 65 warning
California Proposition 65 Warning
WARNING: Some of the products listed on this page may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, click here.
(California law requires this warning to be given to customers in the State of California.)

1/8" Compression Fittings

Description Price & Quantity
1/8" OD Sleeve (ferrule) $0.26
1/8" OD Nut $0.57
1/8" OD Union/Coupler $1.91
Description Price & Quantity
1/8" OD 90° Elbow $6.33
1/8" OD x 1/8" MIPS 90° Elbow $3.20

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

3/16" Compression Fittings

Description Price & Quantity
3/16" OD Sleeve (ferrule) $0.25
3/16" OD Nut $0.47
3/16" OD Union/Coupler $1.47
3/16" OD Tee $6.92
3/16" OD x 3/16" OD x 1/8" MIPS Reducing Tee $3.96
Description Price & Quantity
3/16" OD 90° Elbow $4.99
3/16" OD x 1/8" MIPS 90° Elbow $3.12
3/16" OD x 1/8" MIPS Adapter $1.99
3/16" OD x 1/4" MIPS Adapter $2.25

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

1/4" Compression Fittings

Description Price & Quantity
1/4" OD Nut $0.44
1/4" OD Nut - with poly sleeve - $2.59
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 1/4" MIPS Adapter $1.35
1/4" OD x 1/2" MIPS Adapter $2.47
1/4" OD Plastic Sleeve $0.28

= Limited to Stock

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

5/16" Compression Fittings

Description Price & Quantity
5/16" OD Sleeve (ferrule) $0.26
5/16" OD Nut $0.61
5/16" OD x 1/4" OD Reducing Union/Coupler $4.84
5/16" OD 90° Elbow $4.79
5/16" OD x 1/8" MIPS 90° Elbow $3.29
Description Price & Quantity
5/16" OD x 1/8" MIPS Adapter $3.28
5/16" OD x 1/2" MIPS Adapter $8.43
5/16" OD Plastic Sleeve $0.69
5/16" OD Brass Insert - for 0.187" ID tubing $0.46

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

3/8" Compression Fittings

Description Price & Quantity
3/8" OD Nut $0.79
3/8" OD x 3/8" OD x 1/4" OD Reducing Tee $5.46
3/8" OD 90° Elbow $2.59
3/8" OD x 1/8" MIPS 90° Elbow $3.12
3/8" OD x 1/4" MIPS 90° Elbow $2.93
3/8" OD x 3/8" MIPS 90° Elbow $2.44
Description Price & Quantity
3/8" OD x 1/2" MIPS 90° Elbow $3.17
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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

7/16" Compression Fittings

Description Price & Quantity
7/16" OD Sleeve (ferrule) $0.57
7/16" OD Nut $1.34
Description Price & Quantity
7/16" OD x 1/4" MIPS Adapter $6.22
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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

1/2" Compression Fittings

Description Price & Quantity
1/2" OD Nut $1.03
1/2" OD x 1/2" MIPS 90° Elbow $4.52
1/2" OD x 3/4" FIPS Adapter $7.54
1/2" OD x 1/4" MIPS Adapter $3.97
Description Price & Quantity
1/2" OD x 3/4" MIPS Adapter $6.88
1/2" OD Plastic Sleeve $0.45
1/2" OD Brass Insert - for 3/8" ID tubing $0.64

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

5/8" Compression Fittings

Description Price & Quantity
5/8" OD Sleeve (ferrule) $0.32
5/8" OD Nut $0.82
5/8" OD Union/Coupler $7.19
5/8" OD x 6" long Repair Coupling $13.73
5/8" OD 90° Elbow $6.15
Description Price & Quantity
5/8" OD x 3/8" MIPS 90° Elbow $4.52
5/8" OD x 1/2" MIPS 90° Elbow $5.61
5/8" OD x 3/4" MIPS Adapter $5.18
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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

3/4" Compression Fittings

Description Price & Quantity
3/4" OD Sleeve (ferrule) $0.85
3/4" OD Nut $3.64
Description Price & Quantity
3/4" OD x 3/4" FIPS Adapter $14.97
3/4" OD x 3/4" MIPS Adapter $7.49

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

7/8" Compression Fittings

Description Price & Quantity
7/8" OD Sleeve (ferrule) $0.95
7/8" OD Nut $3.21
Description Price & Quantity
7/8" OD x 1" MIPS Adapter $15.39

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) - $0.79 or (1/2" x 520" roll) - $0.99
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 -

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.

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.



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