Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 2" End Conns, 4" Element, Explosion Group IIA (D); Max. Operating Pressure: 17.4 PSI Abs.;Max Operating Temperature: '=< 140 Deg. F; 1.4571 (SST) Element & Rim Material - No Casing; Nbr Gasket Material; Housing Material 1.4581 SST, ASME B16.5 150RF Flange Connection,;Two G-1/2" Ports On One Side Of The Housing; A2 SST Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Additional SuRFace Coating