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🔐 Lock it down, stand out—secure your trailer like a pro!
The Master Lock 379ATPY Trailer Tongue Lock is a universal, heavy-duty coupler lock designed to fit the most common trailer hitch sizes. Engineered with a pick- and pry-resistant locking mechanism and a rust-proof zinc body, it offers reliable theft deterrence for trailers, RVs, campers, and boat trailers. Ready to use with two keys included, this compact lock is a trusted security solution for professionals and enthusiasts who demand durable, versatile protection in any environment.






















| ASIN | B000L9QRE8 |
| Additional Features | Anti-Corrosion, Cut Resistant, Weather Resistant |
| Best Sellers Rank | #939 in Automotive ( See Top 100 in Automotive ) #3 in Towing Hitch Locks |
| Brand Name | Master Lock |
| Color | Black |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (5,992) |
| Finish Types | Polished |
| Global Trade Identification Number | 00071649229220 |
| Included Components | Unit^Instruction Guide |
| Item Dimensions | 5.1 x 3.5 x 4.6 inches |
| Item Highlight | Universal Trailer Coupler Lock Secures RVs, Campers, Boat and Utility Trailers from Theft, Resists Rust, 2 Keys, Black |
| Item Type Name | Universal Trailer Hitch Lock |
| Item Weight | 16 ounces |
| Lock Type | Key Lock |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 379ATPY |
| Manufacturer Warranty Description | 1 year manufacturer |
| Material Type | Zinc |
| Model Name | Universal Towing Coupler Lock, Steel |
| Model Number | 379ATPY |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Recommended Uses For Product | vehicles, trailers, RVs |
| Shape | Rectangular |
| Style Name | Trailer Hitch Lock |
| UPC | 071649229220 |
| Unit Count | 1 Count |
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