The pump and motor are mounted inside the jack plate body. Saves space and installation time.No addtional lines or pumps needed. Patented design utilizes stainless steel support rods tested to exceed 65 tons of sheer. Anodized aluminum body won't chip. Exclusive bronze oil lite bushings with zerk grease fittings and dual wipers keep salt, sand and silt off stainless rods. 585 lbs. max rating. Available in 4", 6" or 8" setback. OEZ models utilize Ex-Zact Dial, dash mounted precision adjustment. Returns plate to within 1/8" of desired location every time. Eliminates the need to visually reference engine position.