5400 Series Pilot Operated Pressure Vent W/ VTA; 12" Inlet Size, Mates With Standard ASME 150# Flanged Connections; Raised Face Carbon Steel Body & Cover, SST Seat Ring; 41.8" - 86.0" Wc Pressure Spring Range; Fep-Tfe Actuator Diaphragm, Ffkm 1 Pilot Seals & Seat; Standard - Internal Sensing,SST Pilot, Exhaust To Atmosphere