Model 660 Disc Brake Actuator features the Drop N Go Auto Latch Coupler that will auto-latch onto the hitch ball when set on top of the hitch, with minimal weight and effort. Solenoid plumbing built into the master cylinder allowing for easier and faster maintenance service. Product mounts on a 3” tongue, 2″ ball. Additional features include a cast steel ball clamp, grease fittings on roller pins, safety pin that locks the ball clamp in place, coiled e-stop cable.