Description
About the 378DAT Trailer Coupler Lock
Trailers sit exposed to rain, road grime, and opportunistic theft the moment they're parked and left unattended. The 378DAT Trailer Coupler Lock guards where thieves look first: the coupler itself. It turns a vulnerable hitch point into a locked barrier that resists both weather and tampering.
Master Lock 378DAT
The Master Lock No. 378DAT features a 2-5/16in (59mm) trailer coupler lock, designed to resist rust and corrosion. The advanced locking mechanism resists picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.
If you also secure indoor equipment or storage lockers, laminated padlocks handle those lighter-duty spaces well.
This is a retail-packaged product intended for resale. Quantity order increments may apply.
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Model # |
378DAT |
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Key Option |
Keyed Different |
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Color Option |
N/A |
378DAT Trailer Coupler Lock Product Highlights
- Fits 2-5/16in (59mm) trailer couplers
- Advanced locking mechanism resists picking and prying
- Easy to install and remove
- Resists rust and corrosion
Best Used For: Outdoors
1st-in-Padlocks stocks trailer, cargo, and towing security alongside padlocks, hasps, safes, cables, and chains for home and commercial use.
Our team supplies leading brands like Master Lock, American Lock, ABUS, TriMax, and SentrySafe, plus custom keying and keyed-alike programs for fleets and businesses.
Explore our vehicle hitch locks for extra coverage, or reach out to our team to find the best lock for your trailer.
