PV401-AS-V: Aluminium cover, Stainless Steel 316 flange, Viton O-ring.
PV401-SS-V: Stainless Steel 316 cover, Stainless Steel 316 flange, Viton O-ring.
PV401-SST316: Stainless Steel 316 cover, Stainless Steel 316 flange, Teflon encapsulated O-ring.
PV401-AS-BRC:Aluminium cover, Stainless Steel flange with 185 kPa opening pressure for Rail car.