The Brass Slip-Lock Coupling works with 3/8 inch nylon mist tubing and connects in seconds with a simple insert and twist motion. Use to assemble or repair your outdoor mist cooling system. The unique brass Slip-Lock design can be used with both low and high pressure (up to 160 PSI) systems as the coupling grips tighter when the pressure increases. Additionally, the coupling and tubing can be disassembled by simply compressing the ferule against the body and pulling away from the tubing, making the Slip-Lock coupling a versatile mist system fitting.