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 guest’s 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 locking system holds the tubing firmly in place. Disconnection is just as easy and requires no special tools.About this item John guest push-to-connect technology provides a simple, reliable, leak-free connection Manufactured from white polypropylene and equipped with EPDM o-rings Can be used with plastic or soft Copper tubing Manufactured with FDA compliant materials and NSF 61 and 51 certified Lead-free, corrosion free, non-toxic, and more chemically resistant than other plastics