Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Master Lock Trailer Coupler Lock
Video of Master Lock 1-7/8" and 2" Trailer Coupler Lock
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today we are going to show you a lock from Master Lock, a trailer coupler lock part # 377DAT. We will show you how to operate the lock. You simply turn the key, pull back the shackle, install on the coupler and push the shackle back in. This lock is not limited to the coupler you see here, it will work with all couplers that have this flange around it, and as long as you can insert the ball you will be fine. This is the Master Lock trailer coupler lock, part # 377DAT.
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Average Customer Rating: 
4.8 out of 5 stars (12 Customer Reviews)
by: Bruce S.10/03/2011
Is this review helpful?
This lock was exactly what I needed. The quality is excellent and the price very reasonable. As always, shipping was fast!25030
by: Pat03/16/2011
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I couldn't find a trailer lock to work on my car hauler anywhere in Denver, Colorado. etrailer had not only one but 5 that fit the bill. I love a choice. It got here in 2 days using regular shipping and fit like a glove. 9513
by: Dave W.03/07/2011
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Product was shipped same day and arrived quickly. We purchased these locks in the past and the quality remains great. Will continue to do so in the future! Thanks etrailer!8679
by: Andy. E03/23/2013
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I really like this style lock. Very sturdy and secure. I had already owned two others before this one and was very satisfied!! I really like everything about etrailer.com and will definitely order from them for future needs. Thanks. 72026
by: James02/14/2013
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Product was exactlly what I ordered and expected. I purchased 2 locks and requested they be "keyed alike". I received the locks (that worked great, and were keyed alike) very quickly. I got several emails from real people that let me know the status of the shipping. This is the first time I have purchased a product from etrailer.com, but it will not be the last. The cost was 25% cheaper than retail. I could not find the product on retailers shelves. I found the product, saved money, and got it fast with etrailer.com66300
by: mike morris11/20/2012
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lock arrived today, have,nt tried it on traler yet, but found out that key was very hard to insert in lock for some reason, had to keep trying till i coud insert key to open. If there is some trick to inserting the key, please instruct me. merchandise came in a timely manner. thanks mike.59836
by: Ken B07/23/2012
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Works like a charm. 48945
by: Marlan Hvinden07/13/2012
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The locks are the same quality and construction as one I have owned for many years. Delivery was timely.47794
by: 377dat06/21/2012
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have one, for years, thanks,like catalog, if you do that.45134
by: Steve L.06/12/2012
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Way Solid Lock, No Way Anyone Is Getting Off.43895
by: Fred S.05/23/2012
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Product was better than expected, delivery time was great! Thanks41451
by: Vernon W.11/03/2011
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Picture of lock. 26495
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