4200 Series Rev B Spring Loaded Pressure/Vacuum Relief Vent With Pipe Away; Mates With 2" PN16 Inlet Flange Connection; Mates With 2" PN16 Outlet Flange Connection; Raised Face Stainless Steel Body And Cover With Stainless Steel Trim With Pressure And Vacuum Flame Screens; Epdm Pallet Diaphragm; > 10 - 12 PSIG Pressure Spring Range; < .5 PSIG SST Weight Loaded Vacuum Pressure Range