Model 1049 Rev A Pilot Operated Vent Valve; Stainless Steel Body; 2" Inlet X 3" Outlet, Mates With PN16 RF Flanged End Connections; FFKM 1 Soft Seats; Remote Sensing, Stainless Steel Pilot Filter Element, Pilot Exhaust Tubed To Main Valve Outlet; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 18.1" - 36.0" wc Pressure Range; Assemble With Silicone Free Lubricants Only (Christo-Lube MCG-111 And Loctite LB 771 Nickel Anti-Seize Approved); Statement Of Silicone Free Materials And Lubricants Provided