Adjustable Back Pressure Relief Valve, Body Material PVC, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 1 1/2 in, Outlet Size 1 1/2 in, Pressure Range 5 to 100 psi, Overall Height 13 1/4 in, Application Acids, Highly Corrosive Liquids, Overall Length 4 1/2 in, Seat Material Viton, Spring Material Zinc-Plated Steel, Temp. Range 32 Degrees to 140 Degrees F, Test Lever No