Watts Aqualock 1/2" ODx1/2" OD Tube Quick Connect Pipe Elbow. This corrosion-resistant, lead-free elbow is designed for underground use and has a maximum working pressure of 150 psi and a maximum working temperature of 140 degrees Fahrenheit. It is not for use with steel or in concealed installations. It incorporates stainless steel gripping teeth in its collect, allowing it to interconnect with multiple materials without special tools or tube inserts. The tubing can still swivel while connected, even under maximum pressure.