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. 432-4726
Mfr. Part No.6MSC6N-316
BrandParker
SGD20.23
Each
units
- Coupler - 3/8 in NPT Straight 3/8in NPT -
RS Stock No. 439-931
Mfr. Part No.0106 12 00
BrandLegris
SGD10.274
Each (In a Pack of 5)
units
12mm Equal End Coupler Brass - Straight - - -
RS Stock No. 432-4669
Mfr. Part No.6SC6-316
BrandParker
SGD22.43
Each
units
- Union - - Straight 9/16-20 - -
RS Stock No. 432-4653
Mfr. Part No.4SC4-316
BrandParker
SGD20.09
Each
units
- Union - - Straight 7/16-20 - -
RS Stock No. 432-0320
BrandRS PRO
SGD4.975
Each (In a Pack of 2)
units
15mm Coupler Brass 3/8 in BSPP Male Straight 3/8in BSPP Male
RS Stock No. 231-4963
Mfr. Part No.0105 06 13
BrandLegris
SGD3.20
Each (In a Pack of 5)
units
6mm Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 293-6692
Mfr. Part No.0105 08 10
BrandLegris
SGD3.21
Each (In a Pack of 5)
units
8mm Coupler Brass 1/8 in BSPT Male Straight 1/8in BSPT Male
RS Stock No. 439-789
Mfr. Part No.0109 12 21
BrandLegris
SGD16.706
Each (In a Pack of 5)
units
12mm Elbow Brass 1/2 in BSPT Male 90° 1/2in BSPT Male
RS Stock No. 234-8966
Mfr. Part No.WU7068/3
BrandWade
SGD6.15
Each (In a Pack of 2)
units
3/8in Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 231-4985
Mfr. Part No.0105 10 13
BrandLegris
SGD4.97
Each (In a Pack of 5)
units
10mm Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 295-2672
Mfr. Part No.1806 10 00
BrandLegris
SGD49.21
Each
units
- Coupler - - Straight - - -
RS Stock No. 796-751
BrandRS PRO
SGD7.685
Each (In a Pack of 2)
units
12mm Coupler Brass - Straight - - -
RS Stock No. 432-4990
Mfr. Part No.M12RUM6-316
BrandParker
SGD41.48
Each
units
- Reducer Union - - - - - -
RS Stock No. 439-420
Mfr. Part No.1805 08 13
BrandLegris
SGD26.21
Each
units
- Coupler - 1/4 in BSPT Male Straight 1/4in BSPT -
RS Stock No. 293-6541
Mfr. Part No.0109 08 17
BrandLegris
SGD7.848
Each (In a Pack of 5)
units
8mm Elbow Brass 3/8 in BSPT Male 90° 3/8in BSPT Male
RS Stock No. 439-414
Mfr. Part No.1805 06 13
BrandLegris
SGD26.07
Each
units
- Coupler - 1/4 in BSPT Male Straight 1/4in BSPT -
RS Stock No. 432-4710
Mfr. Part No.4MSC4N-316
BrandParker
SGD16.30
Each
units
- Coupler - 1/4 in NPT Straight 1/4in NPT -
RS Stock No. 231-4812
Mfr. Part No.0116 12 00
BrandLegris
SGD16.84
Each (In a Pack of 5)
units
12mm Bulkhead Coupler Brass - Straight - - -
RS Stock No. 231-4799
Mfr. Part No.0116 06 00
BrandLegris
SGD6.74
Each (In a Pack of 5)
units
6mm Bulkhead Coupler Brass - Straight - - -
RS Stock No. 432-0291
BrandRS PRO
SGD5.445
Each (In a Pack of 2)
units
10mm Coupler Brass 1/2 in BSPP Male Straight 1/2in BSPP Male