The Mueller Industries AH15514 Angle Pressure Relief Valve is a high-pressure HVAC valve designed with a 1/2-inch NPTFE connection and 5/8-inch flare fitting, rated up to 400 PSI. It operates by relieving excess system pressure when it exceeds a safe preset level, helping protect equipment and components from pressure-related damage. Commonly used in refrigeration and air-conditioning... https://www.partshnc.com/ah15514-mueller-industries-400-12x58-ang-nptfe-flr-prv