This adjustable pressure relief valve is a replacement parts which is commonly found on vacuum tanks, vacuum trailers, frac tanks, storage tanks, and pressure vessels. It is made of durable brass and has is made for 1-1/2″ pipe fittings. The inlet fitting is a 1-1/2″ NPT. The outlet fitting is a 1-1/2″ hose shank fitting. The pressure release flow is 230 cubic feet per minute (CFM). These pressure release valves are non code and cannot be used on tanks that store or haul corrosives, explosives or combustible materials.