Series 6A00 Deflagration Flame Arrestor, Concentric Version, ISO 16852 Certified; 2" Line Size, 4" Element, Explosion Group IIA1 (D1); Maximum Operating Pressure: 16 PSI absolute, Maximum Operating Temperature: =< 140F; 1.4571 (Stainlesss Steel) Element And Rim Material - No Casing; FKM/FEP Seamless Covered Gasket Material; Housing Material 1.0619 Steel, ASME 150 RF Flanged 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; Adhesive Label Indicating Endurance Burn Proof Construction; Signal Blue (RAL 5005) Surface Coating