3/8", Brass, Slip Lok Coupling, Use To Connect Outdoor Mist Cooling System Lines & Assembles In Seconds With A Simple Insert & Twist Motion, Use With Both Low & High Pressure, Up To 160 PSI, Systems As The Coupling Grips Tighter When The Pressure Increases, Can Be Disassembled By Simply Compressing The Ferule Against The Body & Pulling Away From The Tubing.