Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 1-1/2" Line Size, 4" Element, Explosion Group IIA (D); Maximum Operating Pressure: 17.4 PSI absolute, Maximum Operating Temperature: =< 140F; 1.4571 Stainlesss Steel Element And Rim Material - No Casing; FKM Gasket Material; Housing Material 1.4581 Stainless Steel, NPT Threaded End Connections, Two G-1/2" Ports On One Side Of The Housing; A4 Stainless Steel Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Additional Surface Coating