Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 2" End Conns, 4" Element, Explosion Group IIB1 (C); Max. Operating Pressure: 20.3 PSI Abs;Max. Operating Temperature: '=< 140 Deg. F; 1.4571 (SST) Casing, Element & Rim Material; FKM Gasket Material; Housing Material 1.4581 SST, ASME B16.5 150RF Flange Connection,;One G-1/2" Port On One Side Of The Housing; A2 Stainless Steel Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Additional SuRFace Coating