The Trimax UMAX100 coupler lock features an exclusive design that provides 360 degrees of hardened steel protection for your unattended trailer. It provides instant security for your camper, boat, or trailer when they are not hooked up to your vehicle. This lock features a huge 6-tooth, 3/8″ dual ratchet locking system, a hardened 5/8″ 16mm steel shackle, and 1/2-turn technology that cannot be false locked. For dual force security, add a Trimax chain or cable secured to an anchor point. Also, add a Trimax coupler lever lock for additional protection.

This lock is easy to install–simply slide the ball up into coupler and replace the U-shackle. The UMAX100 fits all of the following couplers and more: 1-7/8″ or 2″ Fulton, Atwood 2″, UFP, Bulldog, 2-5/16″ couplers, Fulton Heavy Duty, Surge Brake (reverse mount). Tested to be tough, Trimax offers a lifetime warranty on all of their products.