Adjustable Back Pressure Relief Valve Body Material PVC Inlet Type FNPT Outlet Type FNPT Inlet Size 1/2 In. Outlet Size 1/2 In. Pressure Range 5 to 100 psi Overall Height 7-1/4 In. Application Acids Highly Corrosive Liquids Overall Length 2-1/2 In. Seat Material Viton Spring Material Zinc-Plated Steel Temp Range 32 Degrees to 140 Degrees F Test Lever No