John Guest Speedfit Male Shut-Off Valve OD x 3/8" NPTF Push-to-Connect (Pack of 5)The John guest 3 8 OD x 3 8 NPT push to connect to male valve is manufactured from white polypropylene and equipped with epdm o rings utilizing John guests push fit technology to make easy, reliable, leak free connections. They have been developed to satisfy the compatibility needs for a wide range of applications and can be used on plastic or soft copper tubing. To make a connection, the tube is simply pushed in by hand; the unique John guest collet