Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 2" End Conns, 4" Element, Explosion Group IIB3 (C); Max. Operating Pressure: 17.4 PSI Abs.;Max Operating Temperature: '=< 140 Deg. F; 1.4571 (SST) Casing, Element & Rim Material; NBR Gasket Material; Housing Material 1.0619 Steel, ASME B16.5 150RF Flange Connection,;One G-1/2" Port On Each Side Of The Housing; 8.8 Zinc Plated Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Additional SuRFace Coating