Boat Leveler to Bennett Actuator Conversion Kit - Hydraulic to Hydraulic. Bennett Marine's V351CK conversion kit replaces Boat Leveler cylinders with Bennett though-hull fittings. Kit includes: 2 hydraulic cylinders and all hardware to convert your system. 2 stainless steel conversion brackets. 8 1/4-20 x 1/2 machine screws. 4 1/4-20 x 3/4 wood screws. 2 3" pipe nipples. 2 female barb fittings. 2 actuators