Compression Fittings

What are compression fittings?
Suitable for use in both commercial and residential applications, brass and copper compression fittings are an easy and practical plumbing method for both DIY and professional plumbers. Available in a variety of standard sizes each in different profiles such as straight connectors, 90-degree elbow, equal tee as well as reducing fittings from one size to another. Connecting copper pipe is easy with the range of fittings available with minimal effort.

How do compression fittings work?
Standard compression fittings are simple and easy to use fitting as simple as the name sounds. Made up of three basic pieces, a compression fitting uses a threaded nut with a hole in that tightens down to the compression fittings body. This tightens down over a small typically brass ring called an Olive that is placed between the nut and the body of the fitting. This olive is compressed by the tightening of the nut to the body creating a sealed joint.

What size do I need?
Always check the exact size of the pipe or fitting to be used when plumbing and a range of metric and imperial fittings are available and ensuring the correct size is selected is key to making an exact and well-sealed joint.

Using Compression Fittings
Most standard compression fittings just require two spanners to install, these can either be fixed or adjustable spanners used to tighten the fittings nut down for the best seal. PTFE tape may also be used over the fittings thread to give the best seal and limit the risk of leaking over time.

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Description Price Compression Connection Pipe Diameter Fitting Type Material Threaded Connection Fitting Direction Thread Size Thread Standard Gender
RS Stock No. 231-4979
Mfr. Part No.0105 08 13
BrandLegris
$4.852
Each (In a Pack of 5)
units
8mm Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 439-644
Mfr. Part No.0101 06 10
BrandLegris
$6.222
Each (In a Pack of 5)
units
6mm Coupler Brass 1/8 in BSPP Male Straight 1/8in BSPP Male
RS Stock No. 231-4806
Mfr. Part No.0116 08 00
BrandLegris
$7.65
Each (In a Pack of 5)
units
8mm Bulkhead Coupler Brass - Straight - - -
RS Stock No. 432-4710
Mfr. Part No.4MSC4N-316
BrandParker
$17.03
Each
units
- Coupler - 1/4 in NPT Straight 1/4in NPT -
RS Stock No. 439-408
Mfr. Part No.1805 08 10
BrandLegris
$26.23
Each
units
- Coupler - 1/8 in BSPT Male Straight 1/8in BSPT -
RS Stock No. 295-2852
Mfr. Part No.1810 06 00
BrandLegris
$9.996
Each (In a Pack of 5)
units
- Sleeve Nut - M10 x 1 - M10 x 1 Metric -
RS Stock No. 295-2593
Mfr. Part No.1805 10 17
BrandLegris
$40.13
Each
units
- Coupler - 3/8 in BSPT Male Straight 3/8in BSPT -
RS Stock No. 234-8887
Mfr. Part No.WU1068
BrandWade
$12.26
Each (In a Pack of 2)
units
3/8in Coupler Brass 3/8 in BSPP Male Straight 3/8in BSPP Male
RS Stock No. 432-0500
Mfr. Part No.720038
$9.615
Each (In a Pack of 2)
units
22mm Coupler Brass 3/4 in BSPP Female Elbow 3/4in BSPP Female
RS Stock No. 234-8786
Mfr. Part No.WU1043
BrandWade
$6.60
Each (In a Pack of 2)
units
1/4in Coupler Brass - Straight - - -
RS Stock No. 234-8994
Mfr. Part No.WU7071/3
BrandWade
$15.075
Each (In a Pack of 2)
units
1/2in Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 293-6591
Mfr. Part No.0109 16 21
BrandLegris
$17.724
Each (In a Pack of 5)
units
16mm Elbow Brass 1/2 in BSPT Male 90° 1/2in BSPT Male
RS Stock No. 295-2688
Mfr. Part No.1816 10 00
BrandLegris
$80.21
Each
units
- Coupler - - Straight - - -
RS Stock No. 439-666
Mfr. Part No.0101 06 13
BrandLegris
$5.012
Each (In a Pack of 5)
units
6mm Coupler Brass 1/4 in BSPP Male Straight 1/4in BSPP Male
RS Stock No. 439-751
Mfr. Part No.0109 04 13
BrandLegris
$7.704
Each (In a Pack of 5)
units
4mm Elbow Brass 1/4 in BSPT Male 90° 1/4in BSPT Male
RS Stock No. 432-4776
Mfr. Part No.4ET4-316
BrandParker
$38.17
Each
units
- Union - - Tee 7/16-20 - -
RS Stock No. 439-436
Mfr. Part No.1805 12 21
BrandLegris
$46.43
Each
units
- Coupler - 1/2 in BSPT Male Straight 1/2in BSPT -
RS Stock No. 432-4990
Mfr. Part No.M12RUM6-316
BrandParker
$47.27
Each
units
- Reducer Union - - - - - -
RS Stock No. 439-587
Mfr. Part No.1802 12 00
BrandLegris
$75.57
Each
units
- Elbow - - 90° - - -
RS Stock No. 432-4697
Mfr. Part No.SCM10-316
BrandParker
$28.57
Each
units
- Union - - Straight - - -
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