Technical Specification Valve Size 1", 1 1/4", 1 1/2", 2", 2 1/2" screwed/Flenged end Outlet Pressure 1 1/2" W. C. to 2 PSI Diaphragm Case Die Cast Aluminum / CS / SS inlet Pressure 15 PSI Body Material C.S./CF8/CF8M Spring Color coated spring steel material Double Acting Vent Damper : Assure fast response plus stable operation. Internal Control Tube : Engineered for accurate pressure Removable orifice : Precision knife-edge plus molded soft seats assure positive tight shutoff orifice in 3/4", 1" and 1