Model 1049 Rev A Pilot Operated Vent Valve; Stainless Steel Body; 12" Inlet X 16" Outlet Mates WIth ASME 150 Flanged End Connections; FFKM 2 Soft Seats; Option 1: Internal Sensing With Pilot Exhaust Tubed To Main Valve Outlet; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 3.2 - 14.0 psi Pressure Range; REV LEVEL A; PER SPQ NUMBER 54733- WITH TAMPER PROOF WIRE AND SEAL