CAST IRON IB STEAM TRAP DSC DSC No.981 ~ 985 SERIES MOP 17K x 230℃ DSC DSC No.991 ~ 996 SERIES MOP 17K x 230℃ DSC DSC No.40~ 46 SERIES MOP 17K x 230℃ DSC DSC No.981K ~ 985K SERIES MOP 17K x 230℃ DSC DSC No.991K ~ 995K SERIES MOP 17K x 230℃