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Simple, straightforward and low shipping rates for these compression fittings.


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.


Click on any image below to be directed to that section





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

Compression Sleeves
A.K.A. Ferrules
Sleeve
Sleeve Size Price & Quantity
1/8" OD $0.26
3/16" OD $0.25
1/4" OD $0.13
5/16" OD $0.26
3/8" OD $0.16
Sleeve Size Price & Quantity
7/16" OD $0.57
1/2" OD $0.25
5/8" OD $0.32
3/4" OD $0.85
7/8" OD $0.87
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Compression Nuts
Nut
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
Nut Size Price & Quantity
7/16" OD $1.34
1/2" OD $1.03
5/8" OD $0.82
3/4" OD $3.64
7/8" OD $2.16
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Brass Compression Nut with Poly Sleeve

Brass compression nut with poly sleeve
Brass compression nut with poly sleeve - 1/4"OD = $2.59
Limited to stock
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Compression Unions / Couplers / Couplings
Unions
Union Size Price & Quantity
1/8" OD $1.91
3/16" OD $1.47
1/4" OD use lead free
5/16" OD $2.23
5/16" OD x 1/4" OD $4.84
3/8" OD x 1/4" OD use lead free
3/8" OD $1.59
Union Size Price & Quantity
7/16" OD $8.16
1/2"OD x 3/8" OD use lead free
1/2" OD use lead free
5/8" OD x 3/8" OD $3.42
5/8" OD $7.19
7/8" OD $6.81
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Repair Coupling (unique)
unique compression repair coupling
5/8" compression fitting on both ends. Slips over 1/2" type M,L or K (5/8" outside pipe)

Repair Coupling size Price & Quantity
5/8" compression - fits over 1/2" CTS - 6" length $12.33

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Compression Reducer (unique)
Unique Reducer
click here for exploded view

Reducer Size Price & Quantity
1/2" Female Comp x 3/8" OD Comp - Chrome
Lead Free
$4.29

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Compression Caps
Cap
Cap Size Price & Quantity
1/4" OD $0.65
3/8" OD use lead free
1/2" OD $1.52
5/8" OD use lead free
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Compression Tees
tee
Tee Size Price & Quantity
1/8" OD $7.47
3/16" OD $6.92
3/16" OD x 3/16" OD x 1/8" MIPS $4.25
1/4" OD $5.39
1/4" OD x 1/4" OD x 1/8" MIPS $5.64
1/4" OD x 1/4" MIPS x 1/4" OD $6.69
1/4" OD x 1/8" MIPS x 1/4" OD $4.38
1/4" OD x 1/4" OD x 1/4" MIPS $6.27
3/8" OD use lead free
1/2" OD $5.69
5/8" OD $7.31
3/8" OD x 3/8" OD x 1/4" OD $5.46
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90° Compression Fittings
90 Compression Fitting
Fitting Size Price & Quantity
1/8" OD $6.55
3/16" OD $3.99
1/4" OD  N/A 
3/8" OD $2.59
5/16" OD $4.29
1/2" OD use lead free
5/8" OD $6.15
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Compression x Fips Adapters
Fips Adapter
Adapter Size Price & Quantity
1/4" OD Comp x 1/8" Fips $2.79
1/4" OD Comp x 1/4" Fips use lead free
1/4" OD Comp x 3/8" Fips $3.35
1/4" OD Comp x 1/2" Fips $3.76
3/8" OD Comp x 1/8" Fips $2.89
3/8" OD Comp x 1/4" Fips $2.89
3/8" OD Comp x 3/8" Fips use lead free
3/8" OD Comp x 1/2" Fips $3.59
Adapter Size Price & Quantity
1/2" OD Comp x 3/8" Fips use lead free
1/2" OD Comp x 1/2" Fips use lead free
1/2" OD Comp x 3/4" Fips $7.54
5/8" OD Comp x 1/2" Fips use lead free
5/8" OD Comp x 3/4" Fips $7.16
3/4" OD Comp x 3/4" Fips $13.97
7/8" OD Comp x 3/4" Fips $5.99
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Need to seal your pipe threads? Click here for PTFE tape and pipe dope.




Compression x Mips Adapters
Mips Adapter
Adapter Size Price & Quantity
1/8" OD Comp x 1/8" Mips $1.89
3/16" OD Comp x 1/8" Mips $1.99
3/16" OD Comp x 1/4" Mips $2.25
1/4" OD Comp x 1/8" Mips use lead free
1/4" OD Comp x 1/4" Mips $1.35
1/4" OD Comp x 3/8" Mips $2.73
1/4" OD Comp x 1/2" Mips $2.47
5/16" OD Comp x 1/8" Mips $3.28
5/16" OD Comp x 1/4" Mips $2.03
5/16" OD Comp x 1/2" Mips $6.23
3/8" OD Comp x 1/8" Mips use lead free
3/8" OD Comp x 1/4" Mips  N/A 
3/8" OD Comp x 3/8" Mips $2.97
3/8" OD Comp x 1/2" Mips $2.63
Adapter Size Price & Quantity
3/8" OD Comp x 3/4" Mips $4.05
7/16" OD Comp x 1/4" Mips $6.22
7/16" OD Comp x 3/8" Mips $6.27
1/2" OD Comp x 1/4" Mips $3.97
1/2" OD Comp x 3/8" Mips use lead free
1/2" OD Comp x 1/2" Mips $3.99
1/2" OD Comp x 3/4" Mips $4.25
5/8" OD Comp x 1/2" Mips use lead free
5/8" OD Comp x 3/4" Mips $5.18
3/4" OD Comp x 3/4" Mips $7.49
7/8" OD Comp x 1/2" Mips $6.95
7/8" OD Comp x 3/4" Mips use lead free
7/8" OD Comp x 1" Mips $12.95
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Need to seal your pipe threads? Click here for PTFE tape and pipe dope.




UNIQUE - Compression x FLARE Adapter

Description Price & Quantity
1/4" OD Compression x 1/4" Male Flare $2.95

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OD Comp x Mips 90°
OD Comp x Mips 90 Fitting
Fitting Size Price & Quantity
1/8" OD x 1/8" Mips $3.20
3/16" OD x 1/8" Mips $3.12
1/4" OD x 1/8" Mips use lead free
1/4" OD x 1/4" Mips $2.23
1/4" OD x 3/8" Mips $3.69
5/16" OD x 1/8" Mips $3.29
3/8" OD x 1/8" Mips $3.12
Fitting Size Price & Quantity
3/8" OD x 1/4" Mips $2.93
3/8" OD x 3/8" Mips $2.44
3/8" OD x 1/2" Mips $3.17
1/2" OD x 3/8" Mips use lead free
1/2" OD x 1/2" Mips $4.52
5/8" OD x 3/8" Mips $4.52
5/8" OD x 1/2" Mips $5.61
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Need to seal your pipe threads? Click here for PTFE tape and pipe dope.




Brass Needle Valve - Angled - Comp x Mips
Angle style brass needle valve
Valve Size Price & Quantity
1/4" OD Comp x 1/8" Mips - lead free $12.19

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We offer many more needle valves here.



Brass Needle Valve - Straight - Comp x Mips
Straight style brass needle valve
Valve Size Price & Quantity
3/16" OD Comp x 1/8" Mips $22.28
1/4" OD Comp x 1/8" Mips $11.48
1/4" OD Comp x 1/4" Mips $10.47
5/16" OD Comp x 1/8" Mips $28.32
3/8" OD Comp x 1/4" Mips $16.87

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Self-Piercing Brass Needle Valve Kit

self-piercing compression angle brass needle valve kit
view larger image


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.


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

Limited to stock while supplies last

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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
1/2" OD $0.45
5/8" OD $0.53
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Brass Inserts For Plastic Tubing
Brass Insert
Brass Insert Fits Plastic Tubing Size Price & Quantity
1/4" 1/4" OD x 0.170" ID tubing use lead free
5/16" 5/16" OD x 0.187" ID tubing $0.46
3/8" 3/8" OD x 1/4" ID tubing $0.33
1/2" 1/2" OD x 3/8" ID tubing $0.64
5/8" 5/8" OD x 1/2" ID tubing $1.05
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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 tubing
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.
Example of how the nut and plastic sleeve should fit easily but snugly over the plastic tubing
When 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 tubing
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.



Thread sealants (IPS threads)
Product Description Price & Quantity
PTFE thread sealing tape PTFE thread sealing tape 1/2" x 260" roll $0.49
1/2" x 520" roll $0.74
1 oz. pipe dope 1 oz. Great White Basic Pipe Joint Compound
- Small, convenient tube
- Great for most plastics and metals
$2.78
Thread Sealing Compound 4 oz. High Quality TU-555 Pipe Joint Compound
- Available in larger sizes, too
- Great for most plastics and metals


Order 12, 24 or 48 of this item for additional savings!
Pricing discounts will show up in your shopping cart.
$7.08
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Sizes are determined by outside diameter (OD) of pipe

Common Terms - and what they mean
  • Comp: Compression
  • OD: Outside diameter of pipe
  • Mips: Male pipe threads on the outside of fitting
  • Fips: Female pipe threads on the inside of fitting

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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