Series 7A00 Rev B Stable Detonation Flame Arrestor Without Restriction, Concentric Version, ISO 16852 Certified; 2" End Conns, 4" Element, Explosion Group IIA; Max. Operating Pressure: 17.4 PSI Abs.; Operating Temperature: =< 302 Deg. F; 1.4571 (SST) Casing, Element, 1.4581 (SST) Rim Material; Fkm Gasket Material; Housing Material 1.0619 Steel, ASME B16.5 150RF Flange Connection,;One G-1/2" Port On Each Side Of The Housing; A2 SST Cap Screw Material; Without Temperature Sensor; Aluminum Name Plate / English Type; No Paint (Cs-Zinc Or SST); Flame Red (Ral3000) Hempadur Surface Coating