The Mueller Industries A15502-650 Relief Valve is a 3/8-inch, 650 PSI pressure safety device designed for commercial HVAC and refrigeration systems, particularly liquid refrigerant receivers. It operates using a spring-loaded mechanism that automatically opens when pressure exceeds its preset 650 PSI limit, allowing excess refrigerant pressure to discharge safely. Featuring 3/8-inch N... https://www.partshnc.com/a15502-650-mueller-industries-38-inch-650-relief-valve