Master Lock Barbell Trailer Coupler Lock (3.5" Long) - 1471DAT 

Master Lock Barbell Trailer Coupler Lock (3.5" Long) - 1471DAT
$24.99
Master Lock Adjustable Coupler Latch Lock - 2847DAT 

Master Lock Adjustable Coupler Latch Lock - 2847DAT
$14.99
Master Lock Trailer Coupler Lock Set - 3794DAT 

Master Lock Trailer Coupler Lock Set - 3794DAT
$74.99