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Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT, Silver
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT, Silver
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The Master Lock No. 378DAT features a 2-5/16 inch (59mm) trailer coupler lock, designed to resist rust and corrosion. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty pr...

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Product Review

The Master Lock No. 378DAT features a 2-5/16 inch (59mm) trailer coupler lock, designed to resist rust and corrosion. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

  • Coupler lock is best used for trailers; Works best with Straight Tongue Trailer Couplers
  • Advance locking mechanism resists picking and prying
  • Designed to resist rust and corrosion
  • Fits 2-5/16 in. (59 mm) trailer couplers; Does not fit Gooseneck Trailer Couplers
  • Includes one trailer coupler lock, two keys

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