Adjustable Back Pressure Relief Valve Body Material PVC Inlet Type FNPT Outlet Type FNPT Inlet Size 1/4 In. Outlet Size 1/4 In. Pressure Range 5 to 100 psi Overall Height 5-1/8 In. Application Corrosives Overall Length 2 In. Seat Material Viton Spring Material Zinc-Plated Steel Temp Range 32 Degrees to 140 Degrees F Test Lever No