TIE DOWN ENGINEERING INC. Model 660 Disc Brake Actuator 82400 Model 660 Disc Brake Actuator Drop N Go auto latch coupler in the closed latch position will auto-latch onto the hitch ball when set on top of the hitch ball, with minimum weight 6,600 lb capacity For use with disc style brakes Solenoid plumbing built into the master cylinder eliminates removal of the entire solenoid for servicing, detachment of brake hose, detachment of the actuator cover and detachment of the actuator unit from the trailer tongue Cast steel ball clamp Grease fittings on roller pin Safety pin that locks the ball clamp, not the latch Aluminum master cylinder PVC coated, coiled E-stop cable Solenoid included Hitch ball not included