Install one and rest easy... these babies make it almost impossible for anyone to drive off with your trailer while you're away. Fits on front of trailer coupler to prevent hitch ball access. Rugged, die-cast zinc body resists corrosion. 4-pin cylinder tumbler.
State Size, as available in the Shopping Cart below. Check the chart below to find the size that fits your coupler.
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Please Note: This item is shipped directly from the factory. To see the expected shipping date, please add it to your Shopping Cart. Sorry, no express shipping available. We are unable to ship factory direct items to Canada, Puerto Rico, Alaska & Hawaii or APO or FPO addresses.
Master Lock® Coupler Lock
||Acme, Big Boy, Fulton, Hammer Blow, Ideal and Lainson 1 7/8" couplers
||Valley 1 7/8" couplers, Acme, Big Boy, Fulton,
Dico, Ideal, Lainson and Valley 2" couplers
||Marvel MC-683, MC-883, MC-939, MC-970, Lainson 2" and 2 5/16" couplers
||Fulton 33-305, 34-300, 34-308, Valley 5125, 5135, 5136
||Hammer Blow 1B, 2B, Lainson 76