John Guest Speedfit Chrome Plated Service Valve 15mm X 1/2" TC 15PTSV (Pack of 5)JG Speedfit brass service valve with tap connectors (chrome plated) for connecting fixtures to pipework. Using a tamperproof 1 4 turn screwdriver slot, the valve enables the flow of water to a fixture to be isolated in the event of an emergency or for maintenance work. Simply push the valve fully onto the pipe and hand tighten the nut on to a side entry tap, toilet or male thread. To demount the push fit connection end, push the collet towards the