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.
Shop Brass Compression Fittings by Size
Shop Brass Compression Fittings by Type
click any of the images below to be directed to that section
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. All brass products on this page are compliant with 2014 Federal Safe Drinking Water Act standards.
Brass Compression Unions / Couplings

Shown: 1/2" x 1/2" OD Union
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Brass Compression 90° Elbows

Shown: 1/2" OD 90° Elbow
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Brass Compression x MIPS 90° Elbows

Shown: 1/2" OD x 1/2" MIPS 90° Elbow
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Need to seal your IPS pipe threads? We've got you covered.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
Brass Compression x FIPS 90° Elbows

Shown: 1/2" OD x 1/2" FIPS 90° Elbow
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Pricing discounts will show up in your shopping cart.
Need to seal your IPS pipe threads? We've got you covered.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
Brass Compression Tees

Shown: 1/2" OD Tee
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Brass Compression x FIPS Adapter

Shown: 1/2" OD x 1/2" FIPS Adapter
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Pricing discounts will show up in your shopping cart.
Need to seal your IPS pipe threads? We've got you covered.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
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
Brass Compression x MIPS Adapter

Shown: 1/2" OD x 1/2" MIPS Adapter
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
Brass Compression Caps

Shown: 1/2" OD Cap
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Brass Compression Sleeves
A.K.A Ferrules

Shown: 3/4" OD Sleeve
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Brass Compression Nuts

Shown: 1/2" OD Nut
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Brass Inserts For Plastic Tubing

Shown: 1/2" OD Brass Insert For Plastic Tubing
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Plastic Sleeves For Plastic Tubing

Shown: 1/2" OD Plastic Sleeve
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Copper Repair Slip Coupling (unique)
SPECIAL Female Compression x Male Compression 90° Elbow
Quick Tee Adapters
Create a branch outlet on a supply stop without shutting off the main water supply

Shown: 1/2" Female Comp x 1/2" Male Comp x 3/8" Male Comp
Features:
- Durable brass construction
- Great for hot or cold water lines
- Ideal for ice makers, dishwashers, and 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 Adapter

The Quick Tee Installed

AFTER Quick Tee Adapter Installed

#993-015NL

#993-016NL

#993-018NL

#993-019NL

#993-020NL
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
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.

Shown: 5/8" OD x 1/4" OD Add-A-Line Tee
Shop Brass Compression Fittings by Size
1/8" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
3/16" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
1/4" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
5/16" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
3/8" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
7/16" Compression Fittings
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Pricing discounts will show up in your shopping cart.
1/2" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
5/8" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
3/4" Compression Fittings
Order 10, 25, 50 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.
7/8" Compression Fittings
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.
To ensure our customers receive fresh products, TU-555 pipe joint compounds are non-returnable.
Compression Fittings Related Items

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.

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. The brass insert is used to keep the inside of the plastic tubing from collapsing as the compression fitting is tightened.
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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