"POLY-MATIC INSTANT FITTING HAS AUTO LOCK AND SEAL, DELRIN RELEASE COLLAR FOR FAST TUBE REMOVAL, ONE PIECE CONSTRUCTION, MALE PIPE THREADS TAPED WITH POLYTETRAFLUOROETHYLENE, SPRING LOCKING TEETH, AND OIL RESISTANT BUNA N O-RING; ITEM WORKS WELL WITH NYLON, POLYETHYLENE OR POLYURETHANE; FITS NYLON AIR BRAKE TUBING"