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. 231-4991
Mfr. Part No.0105 10 17
BrandLegris
TWD113.60
Each (In a Pack of 5)
units
10mm Coupler Brass 3/8 in BSPT Male Straight 3/8in BSPT Male
RS Stock No. 432-0364
BrandRS PRO
TWD423.00
Each
units
28mm Tank Coupler Brass - Straight - - -
RS Stock No. 798-066
BrandRS PRO
TWD163.50
Each (In a Pack of 2)
units
15mm Coupler Brass 3/4 in BSPP Male Straight 3/4in BSPP Male
RS Stock No. 439-931
Mfr. Part No.0106 12 00
BrandLegris
TWD218.40
Each (In a Pack of 5)
units
12mm Equal End Coupler Brass - Straight - - -
RS Stock No. 432-0415
Mfr. Part No.721009
TWD532.00
Each (In a Pack of 2)
units
28mm Equal Tee Brass - - - - -
RS Stock No. 432-4811
Mfr. Part No.ETM6-316
BrandParker
TWD801.00
Each
units
- Union - - Tee - - -
RS Stock No. 178-0073
Mfr. Part No.003634
BrandWatts
TWD805.00
Each
units
- - Brass - - M1 (Outlet) in, MF3/4 (Manifold) in - Female, Male
RS Stock No. 369-1586
BrandRS PRO
TWD215.00
Each
units
22mm Coupler Brass - Straight - - -
RS Stock No. 432-0263
BrandRS PRO
TWD251.50
Each (In a Pack of 2)
units
22 x 15mm Coupler Brass - Straight - - -
RS Stock No. 293-6585
Mfr. Part No.0109 12 17
BrandLegris
TWD232.80
Each (In a Pack of 5)
units
12mm Elbow Brass 3/8 in BSPT Male 90° 3/8in BSPT Male
RS Stock No. 432-0235
Mfr. Part No.709005
TWD161.50
Each (In a Pack of 2)
units
10mm Coupler Brass - Straight - - -
RS Stock No. 293-6557
Mfr. Part No.0109 10 13
BrandLegris
TWD169.60
Each (In a Pack of 5)
units
10mm Elbow Brass 1/4 in BSPT Male 90° 1/4in BSPT Male
RS Stock No. 178-0068
Mfr. Part No.003684
BrandWatts
TWD350.00
Each
units
- - Brass - - M1/2 (Outlet) in, MF3/4 (Manifold) in - Female, Male
RS Stock No. 439-638
Mfr. Part No.0101 04 10
BrandLegris
TWD82.40
Each (In a Pack of 5)
units
4mm Coupler Brass 1/8 in BSPP Male Straight 1/8in BSPP Male
RS Stock No. 439-773
Mfr. Part No.0109 08 13
BrandLegris
TWD133.40
Each (In a Pack of 5)
units
8mm Elbow Brass 1/4 in BSPT Male 90° 1/4in BSPT Male
RS Stock No. 231-5023
Mfr. Part No.0105 12 17
BrandLegris
TWD178.20
Each (In a Pack of 5)
units
12mm Coupler Brass 3/8 in BSPT Male Straight 3/8in BSPT Male
RS Stock No. 796-824
BrandRS PRO
TWD122.50
Each (In a Pack of 2)
units
12mm Coupler Brass 3/8 in BSPP Male Straight 3/8in BSPP Male
RS Stock No. 432-4990
Mfr. Part No.M12RUM6-316
BrandParker
TWD899.00
Each
units
- Reducer Union - - - - - -
RS Stock No. 178-0082
Mfr. Part No.141809
BrandWatts
TWD204.00
Each
units
- - Brass - - 1/2in - -
RS Stock No. 439-565
Mfr. Part No.1802 06 00
BrandLegris
TWD1,026.00
Each
units
- Elbow - - 90° - - -