Series 7J00 Unstable Detonation Flame Arrestor W/O Restriction, Concentric Version, ISO 16852 Certified; 2" End Conns, 4" Element, Explosion Group IIA; Max. Operating Pressure: 17 PSI Abs.;Max. Operating Temperature: '=< 140 Deg. F; 1.4571 (SST) Casing, Element, 1.4581 (SST) Rim Material; Fkm/Fep Seamless Covered Gasket Material; Housing Material 1.4581 SST, ASME B16.5 150RF Flange Connection,;One G-1/2" Port On Each Side Of The Housing; A2 SST Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Additional SuRFace Coating