... hot galvanizedFlange Facing TypesAmerican Series: Flat Face(FF), Raised Face(RF), Tongue(T), Groove(G), Female(F), Male(M), Ring Joints ... ), Type G(O-Ring Spigot), Type H (O-Ring Groove)Industries ServedElectrical power, petroleum, natural gas, chemical, shipbuilding, heating, papermaking, metallurgy ...