1)Approval: FM/UL/CE 2)Material: ASTM A536 3)Finish: Paint,Epoxy Powder,Darcromet 4)Color: RAL3000 UL/FM Grooved Couplings and ... Fittings Approval: UL/FM/CE approvedStandard grooved specifications: according to ... system on subway station ,railway station ,airport, seaport,bridge,etc. UL/FM Grooved Fittings