Masterlock 379ATPY is another variant on the best selling 377DAT coupler lock. The ball insert slides to the desired position and is then locked. Available black version only.

Available keyed different or keyed alike.

• Guards against trailer tow-away theft
• Fits Couplers 1-7/8" (48mm), 2" (51mm) & 2 5/16" (59mm) (Reese, Fulton, Valley, Atwood, Shelby, Putnam, Hammerblow, Dutton Lainson, UFP)
• Advanced locking mechanism resist picking and prying.
• Easy to install and remove