John Guest Speedfit Plastic Stop Valve 15mm (15STV/2) (Pack of 2)JG Speedfit stop valve allows the user to stop the flow of water to a fixture or zone in the event of an emergency or for repair work. Simply push the valve fully onto the pipe. To demount the push fit end, pull the collet towards the body of the push fit fitting and pull the pipe to release. The push fit fitting is quicker and easier to install in confined spaces than traditional methods as it eliminates the need for hot works or tools. Designed,