China 1/2"-48" A234 Wpb ANSI B16.9 ASTM GOST 17375 Carbon Steel Pipe Fittings 30d 45D Sch20 Std Sch40 Carbon Steel Reducer, Find details about China Reducer, Carbon Steel Reducer from 1/2"-48" A234 Wpb ANSI B16.9 ASTM GOST 17375 Carbon Steel Pipe Fittings 30d 45D Sch20 Std Sch40 Carbon Steel Reducer