... Darcromet 3)Size:1"-8" 4)Color:RAL3000 5)FM&UL&CE Features: 1)Grooved Coupling Rigid (Heavy - Duty)2)Finish ... )Color:Red RAL3000,4)Size:1"-8"5)FM and UL Approval6)ANSI, ASTM,DIN,BSUsage:1)Automatic sprinkler system for ... subway station ,railway station ,airport, seaport,bridge,etc 2" FM UL Ductile Iron Grooved Heavy Coupling