The John Guest Shut Off Valve features 1/4 inch Push Fit connections on both ends. This genuine John Guest product is WRAS approved and designed to easily turn water supply off and on. It is suitable for use with 1/4 inch (6.35 mm diameter) water filter tubing. This handy device allows you to provide a shut off facility to your water filter system or water cooler system by simply turning the blue handle. Also known as a ball valve, this John Guest shut off valve offers high reliability and quality, with NSF certification (standard 51 and 62) and FDA approved materials, ensuring safety for water and food applications. The model number is PPSV040808W.