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. 432-0320
BrandRS PRO
£2.985
Each (In a Pack of 2)
Units
15mm Coupler Brass 3/8 in BSPP Male Straight 3/8in BSPP Male
RS Stock No. 432-4748
Mfr. Part No.M6MSC1/4N-316
BrandParker
£5.96
Each
Units
- Coupler - 1/4 in NPT Straight 1/4in NPT -
RS Stock No. 225-7567
Mfr. Part No.07K30P2211D-
£38.92
Each
Units
42mm Deep Seal P Copper 1-1/2 in BSP Female - 1-1/2in BSP Female
RS Stock No. 369-1542
BrandRS PRO
£1.675
Each (In a Pack of 2)
Units
15mm Coupler Brass 1/2 in BSPP Male Straight 1/2in BSPP Male
RS Stock No. 231-4963
Mfr. Part No.0105 06 13
BrandLegris
£1.426
Each (In a Pack of 5)
Units
6mm Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 231-4957
Mfr. Part No.0105 06 10
BrandLegris
£1.294
Each (In a Pack of 5)
Units
6mm Coupler Brass 1/8 in BSPT Male Straight 1/8in BSPT Male
RS Stock No. 231-4979
Mfr. Part No.0105 08 13
BrandLegris
£1.49
Each (In a Pack of 5)
Units
8mm Coupler Brass 1/4 in BSPT Male Straight 1/4in BSPT Male
RS Stock No. 369-1621
BrandRS PRO
£1.995
Each (In a Pack of 2)
Units
15mm Coupler Brass - Elbow - - -
RS Stock No. 231-4991
Mfr. Part No.0105 10 17
BrandLegris
£2.458
Each (In a Pack of 5)
Units
10mm Coupler Brass 3/8 in BSPT Male Straight 3/8in BSPT Male
RS Stock No. 369-1558
Mfr. Part No.711038
£2.39
Each (In a Pack of 2)
Units
22mm Coupler Brass 3/4 in BSPP Male Straight 3/4in BSPP Male
RS Stock No. 432-4760
Mfr. Part No.M12MSC1/2N-316
BrandParker
£13.35
Each
Units
- Coupler - 1/2 in NPT Straight 1/2in NPT -
RS Stock No. 234-8821
Mfr. Part No.WU1063
BrandWade
£2.325
Each (In a Pack of 2)
Units
1/4in Coupler Brass 1/4 in BSPP Male Straight 1/4in BSPP Male
RS Stock No. 225-7551
Mfr. Part No.06J30P2211D-
£36.49
Each
Units
35mm Deep Seal P Copper 1-1/4 in BSP Female - 1-1/4in BSP Female
RS Stock No. 293-6692
Mfr. Part No.0105 08 10
BrandLegris
£1.426
Each (In a Pack of 5)
Units
8mm Coupler Brass 1/8 in BSPT Male Straight 1/8in BSPT Male
RS Stock No. 439-414
Mfr. Part No.1805 06 13
BrandLegris
£11.70
Each
Units
- Coupler - 1/4 in BSPT Male Straight 1/4in BSPT -
RS Stock No. 203-8653
Mfr. Part No.E011020302--
£3.49
Each (In a Pack of 2)
Units
15mm Coupler Brass 1/4 in BSPP Male Straight 1/4in BSPP Male
RS Stock No. 231-4799
Mfr. Part No.0116 06 00
BrandLegris
£3.162
Each (In a Pack of 5)
Units
6mm Bulkhead Coupler Brass - Straight - - -
RS Stock No. 369-1520
BrandRS PRO
£1.575
Each (In a Pack of 2)
Units
15mm Coupler Brass - Straight - - -
RS Stock No. 369-1592
BrandRS PRO
£2.545
Each (In a Pack of 2)
Units
22mm Coupler Brass 3/4 in BSPP Female Straight 3/4in BSPP Female
RS Stock No. 369-2286
BrandRS PRO
£1.855
Each (In a Pack of 2)
Units
15mm Coupler Brass 1/2 in BSPP Female Straight 1/2in BSPP Female