Trimax UMAX100 Universal 'Die-Cast' Dual Purpose Coupler Lock (fits all couplers) Buy Now

I recommend the heavier duty umax100 over the lighter duty umax50. I own both, but this umax100 is a brute. I think you would destroy the coupler before the lock would fail. With these locks I think a thief would walk. Get more detail about Trimax UMAX100 Universal 'Die-Cast' Dual Purpose Coupler Lock (fits all couplers).