Tie Down Model 800 Disc Brake Coupler NEW! 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