Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT
Condition: New
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This item is eligible for return within 30 days of receipt
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
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Availability:
In Stock.
Arrives
Sunday, Jun 28
Recently Viewed
Size: 1 Pack
Features
- Coupler Lock,Universal
- Bright red finish discourages thief's from messing with your trailer
- Advanced locking mechanism resists picking and prying
- Resists rust and corrosion; Simple installation and removal
Description
......
Manufacturer: Master Lock
Brand: Master Lock
Model: 379ATPY
Item Weight: 1 pounds
Product Dimensions: 3.6 x 7.6 x 6.7 inches
Item model number: 379ATPY
Is Discontinued By Manufacturer: No
Exterior: Chrome
Manufacturer Part Number: 389DAT
Special Features: Advanced locking mechanism, Resists picking and prying, Rekeyable
Date First Available: January 26, 2017
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Jun 28
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Size: 4 Pack
Easy to install. Fits nearly every trailer coupler. Design is nearly if not entirely bolt cutter proof.
Reviewed in the United States on April 3, 2026 by Phillip
Size: 1 Pack
Master brand is known for high quality, which usually comes with higher price than competitors. Lots of research done to find a very solid lock for new camper trailer. This lock was reasonably priced, in line with other 'foreign'-named options. Lock arrived quickly AND much better theft protection than a lock through the trailer latching mechanism.
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Reviewed in the United States on March 2, 2026 by James
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This lock has some weight to it. It works great and feels solid. It didn’t fit on my utility trailer but that’s due to my trailer and not this lock. I gave this one to a friend and it has worked on his trailer flawlessly. Definitely worth the money. If it had actually worked on my trailer tongue I’d definitely be keeping it.
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Reviewed in the United States on July 29, 2025 by AhhIBuyTooMuchStuff
Size: 1 Pack
We are owners of a 27 ft travel trailer. I recently wrote a review on another trailer security lock that we purchased for our travel trailer. I mentioned that it was a backup to a more visible security lock. This trailer lock, Master Lock - Universal Size, is our primary security lock. We use this lock because it appears to be very sturdy, not easily defeated, and it has a bright color. While those first two points are probably the most important, it is the bright red color that I like the most. The lock is obvious to potential thieves there is a lock. I can't begin to tell you how many travel trailers we see at campgrounds or in driveways that have no security lock on their front hitch. These are easy targets. Our lock basically says to potential thieves to move on. I highly recommend this product. Trailer Theft is more prevalent than you may think.
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Reviewed in the United States on September 10, 2023 Reviewed in the United States on September 10, 2023 by The Clark Expedition
Size: 1 Pack
The Master Lock Trailer Tongue Lock is a solid choice for securing your trailer. Its sturdy build and durable materials ensure quality and longevity. The lock provides excellent security, deterring potential thieves with its robust design and tamper-resistant features. Plus, its ease of use makes securing your trailer hassle-free, allowing for quick installation and removal. Overall, it's a dependable option for safeguarding your valuable cargo on the road. I’m going to buy more for my other trailers!
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Reviewed in the United States on April 22, 2024 by Natalie Roberts
Size: 1 Pack
I bought the Master Lock Universal Trailer Coupler Lock, and it's been a great addition to my RV setup. It fits perfectly on my 2-inch coupler. It’s solid, durable, and provides that extra layer of security when I’m parked at campgrounds or when my trailer’s stored. The lock is easy to use—just slide it on, lock it in place, and I feel much more confident leaving the trailer behind. It’s made of heavy-duty materials, so I’m not worried about it rusting or breaking. Overall, this Master Lock is a great value for the price and provides peace of mind that my trailer is secure. I highly recommend it to anyone with a trailer or RV!
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Reviewed in the United States on November 24, 2024 by Joan's RV Life
Size: 1 Pack
Fantastic lock, survived 2 theft attempts. Ordering more as backups but very happy it held up
Reviewed in the United States on April 27, 2026 Reviewed in the United States on April 27, 2026 by Irv
Size: 1 Pack
Love the functionality and safety
Reviewed in the United States on February 28, 2026 by JME