PlumbingSupply.com offers Compression Fittings

Compression Fittings
For Use With Copper Or Plastic Tubing

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Customers who have purchased compression fittings have also been:
to chrome, PVC, brass, copper, CPVC and stainless steel fittings all with NO minimums!
to brass fittings - to brass barbed fittings - to acetal compression fittings - to brass tee adapters
to clear vinyl and clear braided tubing - to stainless steel water flex connectors
to pipe fittings, connectors, and adapters - index page

Low rates and easiest to calculate/understand shipping/handling for fittings


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.

Compression Sleeves
A.K.A. Ferrules
Sleeve
Sleeve Size Price & Quantity
1/8" OD $0.20
3/16" OD $0.25
1/4" OD $0.11
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 $0.35
5/16" OD $0.61
3/8" OD $0.40
Nut Size Price & Quantity
7/16" OD $1.34
1/2" OD $1.03
5/8" OD $0.82
3/4" OD $2.61
7/8" OD $2.16

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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 $1.24
5/16" OD $2.23
5/16" OD x 1/4" OD $4.84
3/8" OD x 1/4" OD $1.80
3/8" OD $1.59
Union Size Price & Quantity
7/16" OD $8.16
1/2"OD x 3/8" OD $3.18
1/2" OD $2.71
5/8" OD x 3/8" OD $3.42
5/8" OD $4.30
7/8" OD $6.81

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Compression Caps
Cap
Cap Size Price & Quantity
1/4" OD $0.65
3/8" OD $0.64
1/2" OD $1.52
5/8" OD $1.55

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Compression Tees
tee

Tee Size Price & Quantity
1/8" OD $4.97
1/4" OD $3.14
3/8" OD $3.38
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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to flare fittings


90° Compression Fittings
90 Compression Fitting
Fitting Size Price & Quantity
1/8" OD $4.79
3/16" OD $3.99
1/4" OD $2.47
3/8" OD $2.48
5/16" OD $4.29
1/2" OD $4.09
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 $1.93
1/4" OD Comp x 1/4" Fips $2.11
1/4" OD Comp x 3/8" Fips $2.96
1/4" OD Comp x 1/2" Fips $2.95
3/8" OD Comp x 1/8" Fips $2.89
3/8" OD Comp x 1/4" Fips $2.02
3/8" OD Comp x 3/8" Fips $2.97
3/8" OD Comp x 1/2" Fips $2.99
Adapter Size Price & Quantity
1/2" OD Comp x 3/8" Fips $3.19
1/2" OD Comp x 1/2" Fips $3.45
1/2" OD Comp x 3/4" Fips $7.56
5/8" OD Comp x 1/2" Fips $4.19
5/8" OD Comp x 3/4" Fips $4.49
3/4" OD Comp x 3/4" Fips $13.79
7/8" OD Comp x 3/4" Fips $5.63

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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 $1.11
3/16" OD Comp x 1/8" Mips $1.35
1/4" OD Comp x 1/8" Mips $1.35
1/4" OD Comp x 1/4" Mips $1.35
1/4" OD Comp x 3/8" Mips $1.80
1/4" OD Comp x 1/2" Mips $2.04
5/16" OD Comp x 1/8" Mips $2.03
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 $2.09
3/8" OD Comp x 1/4" Mips $1.90
3/8" OD Comp x 3/8" Mips $1.97
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 $3.17
1/2" OD Comp x 3/8" Mips $2.73
1/2" OD Comp x 1/2" Mips $2.25
1/2" OD Comp x 3/4" Mips $4.25
5/8" OD Comp x 1/2" Mips $3.39
5/8" OD Comp x 3/4" Mips $4.29
3/4" OD Comp x 3/4" Mips $6.49
7/8" OD Comp x 1/2" Mips $5.95
7/8" OD Comp x 3/4" Mips $5.49
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.


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 $2.48
1/4" OD x 1/4" Mips $2.23
5/16" OD x 1/8" Mips $2.91
3/8" OD x 1/8" Mips $2.26
3/8" OD x 1/4" Mips $2.93
Fitting Size Price & Quantity
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 $3.20
1/2" OD x 1/2" Mips $4.52
5/8" OD x 3/8" Mips $4.54
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.


Plastic Sleeves For Soft Tubing
Plastic Sleeve
Plastic Sleeves Price & Quantity
1/4" OD $0.28
5/16" OD $0.39
3/8" OD $0.44
1/2" OD $0.45
5/8" OD $0.53

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Brass Inserts For Soft Tubing
Brass Insert
Brass Inserts Price & Quantity
1/4" OD $0.29
5/16" OD $0.38
3/8" OD $0.29
1/2" OD $0.64
5/8" OD $1.05

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Compression Fitting Sample For Soft Tubing
Before
The size of the plastic sleeve and the brass insert must be chosen according to the outside dimensions of the clear vinyl tubing to be used.
Before
When using plastic tubing, the "plastic sleeve" must be used and the "brass insert" must be used.
Before
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 $0.38
1/2" x 520" roll $0.54
1 oz. pipe dope 1 oz. Great White Basic Pipe Joint Compound
- Small, convenient tube
- Great for most plastics and metals
$2.03
Thread Sealing Compound 4 oz. High Quality TU-555 Pipe Joint Compound
- Available in larger sizes, too
- Great for most plastics and metals
$5.39

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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 about compression fittings

"Should I use PTFE thread sealing tape or pipe joint compound on my compression threads?"
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.

questions about copper compression fittings"How will I know which size compression fittings to use for my copper tubing?"
answers about copper compression fittings 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.

questions about copper compression fittings and using with plastic tubing"I have clear vinyl tubing, can I use these compression fittings with it?"
answers about copper compression fittings and using plastic tubing It really depends on the outside and the inside diameter of the clear vinyl 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 dimensions of the clear vinyl tubing to be used. The brass insert must be able to fit snugly inside the clear vinyl tubing and will generally work if the clear vinyl tubing has 1/16" wall thickness.

questions about pipe terms in the plumbing industry"What is the difference between 'nominal' dimensions and 'outside diameter (OD)' dimensions?"
answers about the term nominal in the plumbing industryNominal 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.

We hope that we have helped you on this page with compression fittings,
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