Master Lock 2-5/16" Trailer Coupler Lock

Master Lock Locks - 378DAT

Trailer Coupler Lock Guards against trailer towaway theft.

• Fits 2-5/16" (48 mm) ball diameter couplers of the following brands:
  • Atwood
    • Will not fit Flat Nose style couplers
  • Reese
  • Fulton
  • Shelby
  • Valley
  • Dutton-Lainson
  • Putnam
  • Acme
  • Ideal
• Advanced Locking Mechanism Resists Picking and Prying
• Easy to Install and Remove
• Lifetime Guarantee

Lock can be keyed alike so that the same key will work on multiple 378DAT locks. Simply select the keyed alike option above and then enter the number of locks needed.

Note: Cannot key the locks to match other styles of locks. Keyed alike option will only match other 378DAT locks.

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• What is the Best Trailer Coupler Lock Made by Masterlock
  
• Depending on the size and style of your trailer coupler I would recommend the following locks made by Master Lock. The first would be the Master Lock 1-7/8 inch and 2 inch Trailer Coupler Lock, item # 377DAT. If you have a 2-5/16 inch coupler the Master Lock 2-5/16 inch Trailer Coupler Lock, item # 378DAT, is an excellent lock that fits many styles of trailer couplers.
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• Coupler Lock for a 2005 Texas Roll Back Trailer With a 2-5/16 inch Bulldog Coupler
  
• I did a little research and your trailer should have a 2-5/16 inch Bulldog coupler. With this style coupler the Master Lock 2-5/16 inch Trailer Coupler Lock, item # 378DAT, will not work. This style coupler lock requires that the trailer coupler has a lip around the front of the coupler. I would recommend the Maximum Security Universal Trailer Coupler Lock for 1-7/8 inch, 2 inch and 2-5/16 inch Couplers, item # DT25013, which will work with almost any style of coupler and provides excellent s
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• Recommendation for a 2-5/16 Inch Trailer Hitch Coupler Lock
  
• The highest rated and most popular 2-5/16 inch trailer coupler lock we carry is the Maximum Security Universal Trailer Coupler Lock, # DT25013. This lock actually will fit 1-7/8, 2, and 2-5/16 inch couplers. It features a pick-resistant lock cylinder and dual-action, bolt-blocked locking system that locks both arms instead of just one. If you really want to surprise a would-be thief, you could use Trailer Anti-Theft Alarm System, # 4840DATSEN. This system provides electronic security through
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• Anti-Theft Product Recommendations for an Enclosed Utility Trailer
  
• The best rated and most popular 2-5/16 inch trailer coupler lock that we carry is the Maximum Security Universal Trailer Coupler Lock, # DT25013. This lock features a pick resistant lock cylinder and dual action, bolt-blocked locking system that locks both arms instead of just one. For added security you could add a Trailer Anti-Theft Alarm System, # 4840DATSEN. This system provides electronic security through a 110 decibel alarm siren that sounds when the trailer wiring is cut or disconnecte
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• What are the Dimensions from the Trailer Coupler Lock Ball to the Locking Bar when Fully Open
  
• I went out to the warehouse and pulled the Master Lock 2-5/16 inch Trailer Coupler Lock, # 378DAT, and produced a short video, see link, showing the distance from the closest point on the ball to the closest point on the locking shank and housing when fully open, which is 1.05 inches and 1.70 inches respectively. I have linked a review video showing the operation of this item also.
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