Tie Down Model 800 Disc Brake CouplerNEW! Drop N Go Auto Latch Coupler in the closed (tow) latch position will auto-latch onto the hitch ball when set on top of the hitch ball, with minimal weight. Solenoid plumbing built into the master cylinder which eliminates removal of entire solenoid for servicing, detachment of brake hose, detachment of the actuator cover and detachment of the actuator unit from trailer tongue. Mounts on a 3" tongue.Additional Features: Cast Steel ball Clamp; Grease fittings on Roller Pin; Safety pin that locks on the ball clamp, not the latch handle; Aluminum master cylinder; Coiled E-stop cable, PVC Coated;