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The John guest 3/8 inch OD Black polypropylene push-to-connect bulkhead union (10-pack) fittings are manufactured from U.V. Stabilized Black 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.