How To Make A Connection – Standard Speedfit

To make a connection, the tube is simply pushed in by hand; the unique patented John Guest collet locking system then holds the tube firmly in place without deforming it or restricting flow. The Collet (gripper) has stainless steel teeth which hold the pipe firmly in position, while the O-Ring provides a permanent leakproof seal.

For more technical information, please consult the John Guest Technical Manual & Trade Price Guide.

How To Make A Good Connection

Fittings and pipe should be kept in their original packaging to ensure they are clean and undamaged before use.

Prepare the Pipe

Ensure the pipe is free of score marks. Cut the pipe square. When using Speedfit Barrier Pipe cut along an insertion mark. We recommend the use of JG Pipe Cutters.

To prevent damage to the O-Ring remove all burrs and sharp edges. When connecting Speedfit pipe use a Superseal Pipe Insert or a Standard Speedfit Pipe Insert. Fully insert using a twisting motion. The insert should only be used with Speedfit Pipe.

Push pipe up to Pipe Stop.

If the Speedfit pipe has been cut correctly the insertion mark on the pipe will be level with the collet head.

Pull to check connection is secure and test the system using our recommended test procedure.

How To Use Collet Covers and Collet Clips

White or grey collet clips are used with standard fittings to prevent accidental pipe disconnection.

How To Disconnect
Ensure that the system is depressurised.

Push the collet square against the face of the fitting. With the collet held in position the pipe can be removed. The fitting can be used again without the need for replacement parts.

What Not To Do

Don’t use hacksaws to cut the pipe or leave burrs on the end of the pipe.


Don’t use damaged or scored pipe. Score marks can cause leaks passed the O-Ring


Don’t forget to push the pipe fully into the fitting, past both the collet (gripper) and the O-Ring.

Use a collet cover or collet clip to provide added security against pipe disconnection, e.g. the fitting coming into contact with rigid surfaces and behind dry-lining walls.

Collet covers for use with standard Speedfit fittings,
are available in white, red or blue to allow colour coding of pipes

How To Use Release Aids

The action of pressure in a system could increase the grip of the collet. The release aid allows a firmer grip on the collet whilst removing the pipe.

How To Use Stop Ends

The unique feature of the Speedfit concept, the ability to disconnect the fitting should you want to, means the Speedfit Stop End not only provides a permanent leakproof seal, but can be readily removed to allow work to restart or to allow an extension to a system. Thus, the fitting is especially useful to allow water to be turned back on, overnight for instance, or if a job has to be interrupted for another reason.

Stop ends are also useful when pressure testing a system before appliances are connected.