Superseded Part HL-800S. L.O.A. Retract 20″. Approx. Stroke 8″. L.O.A. Extend 28″. Features include: Clear anodized aluminium tubing Clutchless ball screw design will not drift, never binds and runs in sync on dual lift applications Inline motor design delivers over 500 lbs of force Water resistant & non-corrosive materials Ball screw spins freely when hatch is fully opened or closed eliminating limit switches and burned out motors Powdered metal gears for strength and precision Stainless steel ram locks in any position CE-certified, ignition protected and ABYC compliant 20 AMP circuit breaker & 20 AMP rated switch required