Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 2" Line Size, 4" Element, Explosion Group IIB3 (C); Maximum Operating Pressure: 17.4 PSI absolute, Maximum Operating Temperature: =< 140F; 1.4571 Stainless Steel Casing, Element And Rim Material; NBR Gasket Material; Housing Material 1.0619 Steel Zinc Plated, NPT Threaded End Connections, 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