Watts Aqualock 3/8" O.D. Tube Quick Connectx1/4" MPT, Male Adapter. It is designed for poly or soft copper tubing and not suitable for steel or concealed installations. With a maximum working temperature of 140°F and a maximum working pressure of 80 psi, this corrosion-resistant and lead-free fitting ensures durability and safety. Its stainless steel gripping teeth allow for easy interconnection with various materials without special tools or tube inserts. Even under maximum pressure, the tubing can still swivel while connected, providing flexibility and convenience.