These single-phase, 240 Volt, auto-hoist, AC power units are interchangeable for all vertical mount, 220 Volt, two and four-post car Hoist power units. They may also be used on any compatible hydraulic lifts and/or scissor lifts. Each unit features a power-up/gravity down function with the lowering movement controlled by the manual release valve. These power units are designed for vertical mount applications only. When you need quality, power, and affordability all rolled into one unit.