S5 Coupler Locks: The best security solution for your trailer. Locks are custom tailored to each trailer coupler's design. Most S5 lock bodies are built with 1/4" structural steel, powder coated using Sherwin Williams powder, and secured with a puck-style lock.
LCS001 - Ram and Bulldog 2 in and 2-5/16 in This locks fits both Ram and BullDog 2" and 2 5/16" couplers. 2" couplers should remain open when the lock is installed. 2 5/16" couplers should be in the closed position. Puck Lock is included in price.