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