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, SST Pilot Filter Element, Pilot Exhaust Tubed To;Main Valve Outlet; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 12.1" - 18.0" wc Pressure Range ; Assemble With Silicone Free Lubricants Only (Christo-Lube MCG-111, Loctite LB 771 Anti-Seize, and Loctite 5113 Thread Sealant Approved); Statement Of Silicone Free Materials And Lubricants Provided