Double Drum Marine Hydraulic Winch 100-1000KN Heavy Duty Mooring Equipment Product Description The double drum marine hydraulic winch is a heavy duty mooring and towing machine built for commercial vessels, offshore support craft and port workboats. Two independent grooved drums run on separate closed-loop hydraulic circuits, so one operator can pay out the bow line while recovering the stern line without stopping the hydraulic power unit. Rated line pull covers 100KN to