How To Make A Connection – Speedfit Twist and Lock

Speedfit Twist and Lock fittings have a unique grip-then-seal construction, made up of a collet with stainless steel teeth, to grip the pipe, and an O-Ring to provide a permanent leak proof 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 Up to Pipe Stop

The fitting should be in the ‘unlocked’ position, this is shown with a small gap between the screwcap and the body flange.

Push the pipe fully into the fitting, up to the pipe stop.

If the Speedfit pipe has been cut correctly the insertion mark on the pipe will be level with the collet head. The O-Ring on the Superseal Pipe Insert provides a secondary seal against the bore of the fitting. A good connection has been made.

Twist the screwcap until it touches the body flange. This increases the O-Ring seal around the pipe and locks the pipe into position.

If you are not using collet clips, ensure that the screwcaps are in the locked position. Pull to check it is secure. It is good practice to test the system prior to leaving the site or before use, using our recommended test procedure.

How To Use Collet Clips

Red or blue collet clips provide colour coding of pipe on Twist & Lock fittings. They are not designed to prevent accidental release and should be fitted when the fitting is in the locked position.

How To Disconnect
Ensure that the system is depressurised.

The screwcap on Twist & Lock fittings will need to be turned back to the unlocked position.

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.

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.