---
product_id: 7757162
title: "Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock for Securing RV’s, Horse Trailers, Tool Trailers and More, 379ATPY"
brand: "master lock"
price: "€ 90.22"
currency: EUR
in_stock: true
reviews_count: 13
category: "Master Lock"
url: https://www.desertcart.sk/products/7757162-master-lock-black-universal-size-trailer-hitch-lock-trailer-coupler
store_origin: SK
region: Slovakia
---

# Universal fit for 3 coupler sizes Rust & corrosion resistant zinc build Advanced pick & pry resistant lock Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock for Securing RV’s, Horse Trailers, Tool Trailers and More, 379ATPY

**Brand:** master lock
**Price:** € 90.22
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock it down, stand out with confidence.

## Quick Answers

- **What is this?** Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock for Securing RV’s, Horse Trailers, Tool Trailers and More, 379ATPY by master lock
- **How much does it cost?** € 90.22 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/7757162-master-lock-black-universal-size-trailer-hitch-lock-trailer-coupler)

## Best For

- master lock enthusiasts

## Why This Product

- Trusted master lock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Next-Level Security Mechanism:** Advanced locking tech that says ‘not today’ to thieves and tamperers.
- • **Weatherproof Zinc Construction:** Built tough to withstand rain, rust, and relentless outdoor conditions.
- • **Effortless Installation & Removal:** No tools, no hassle—secure your trailer in seconds and hit the road faster.
- • **Fits 1-7/8", 2", & 2-5/16" Couplers:** One lock to secure all your trailers—versatility that means no compromises.
- • **Trusted Brand with Lifetime Warranty:** Master Lock reliability backed by a limited lifetime warranty for peace of mind.

## Overview

The Master Lock 379ATPY is a universal trailer hitch lock engineered to fit the most common coupler sizes (1-7/8", 2", and 2-5/16"). Crafted from corrosion-resistant zinc and featuring an advanced locking mechanism, it offers robust protection against picking and prying. Designed for quick, tool-free installation, this lock delivers reliable security for RVs, horse trailers, and utility trailers alike, backed by a limited lifetime warranty from a trusted industry leader.

## Description

The Master Lock 379ATPY features a universal trailer coupler lock, designed to fit 1-7/8 in. (48 mm), 2 in. (51 mm) and most 2-5/16 in. (59 mm) couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

Review: Solid, Simple Trailer Hitch Lock That Adds Real Peace of Mind - The Master Lock 379ATPY universal trailer hitch lock is a straightforward, effective security solution that does exactly what it’s meant to do. If you’re looking for an easy way to secure a trailer without overthinking the setup, this lock delivers dependable protection with minimal hassle. Fit and compatibility are strong points. The universal design works well across different types of trailers, including RVs, utility trailers, horse trailers, and tool trailers. It fits securely over the coupler and blocks it effectively, preventing anyone from hitching up and towing off your trailer. Once installed, it’s very clear the trailer isn’t going anywhere. Build quality feels solid. The lock has a good weight to it and doesn’t feel thin or easily defeated. While no lock is completely theft-proof, this one is sturdy enough to act as a strong deterrent. It sends a clear message that the trailer is protected and not an easy target, which is often half the battle when it comes to theft prevention. Installation is quick and simple. You don’t need tools or complicated adjustments. It slides into place easily and locks securely. Removing it is just as easy when you’re ready to use the trailer, which makes it convenient for regular use without becoming annoying. The locking mechanism works smoothly. The key turns cleanly without sticking, and the lock opens and closes without feeling gritty or cheap. That’s important for something that may sit outdoors and be exposed to weather. So far, it’s held up well without signs of binding or corrosion. The black finish keeps it discreet while still looking tough and purposeful. It doesn’t draw unnecessary attention, but it’s obvious enough to let would-be thieves know the trailer is secured. It also looks clean and professional, whether the trailer is parked at home, a storage lot, or a campsite. Overall, this Master Lock trailer coupler lock is a reliable, easy-to-use security accessory that does its job well. Strong fit, solid construction, simple operation, and broad compatibility make it a smart choice for protecting trailers of all kinds. If you want added peace of mind without complexity, this is an easy five-star product.
Review: Perfect Fit and Great Peace of Mind - This Master Lock fits my trailer perfectly and feels very secure. It was easy to install and solidly built. Once it’s on, I feel confident that it will help prevent my trailer from being stolen. Definitely gives me peace of mind and I would recommend it to anyone looking for a reliable trailer lock.

## Features

- Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
- Trailer lock is best used for vehicles, trailers, and RVs
- Trailer coupler lock features advanced locking mechanism to resist picking and prying
- Trailer hitch lock is constructed from zinc to resist rust and corrosion
- Includes one trailer coupler lock, two keys

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000L9QRE8 |
| Best Sellers Rank | #1,978 in Automotive ( See Top 100 in Automotive ) #4 in Towing Hitch Locks |
| Brand | Master Lock |
| Color | Black |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (5,796) |
| Date First Available | June 11, 2007 |
| Domestic Shipping | Item can be shipped within U.S. |
| Finish Type | Polished |
| Global Trade Identification Number | 00071649229220 |
| Included Components | Unit^Instruction Guide |
| International Shipping | This item can be shipped to select countries outside of the U.S. Learn More |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1 pounds |
| Item dimensions L x W x H | 5.1 x 3.5 x 4.6 inches |
| Item model number | 379ATPY |
| Lock Type | Key Lock |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 379ATPY |
| Material | Zinc |
| Model Name | Universal Towing Coupler Lock, Steel |
| Number of Pieces | 1 |
| Product Dimensions | 5.1 x 3.5 x 4.6 inches |
| Recommended Uses For Product | vehicles, trailers, RVs |
| Shape | Rectangular |
| Special Feature | Portable |
| Special Features | Portable |
| Style | Trailer Hitch Lock |
| UPC | 071649229220 |

## Product Details

- **Brand:** Master Lock
- **Item dimensions L x W x H:** 5.1 x 3.5 x 4.6 inches
- **Lock Type:** Key Lock
- **Material:** Zinc
- **Special Feature:** Portable

## Images

![Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock for Securing RV’s, Horse Trailers, Tool Trailers and More, 379ATPY - Image 1](https://m.media-amazon.com/images/I/81u7s58ERrL.jpg)

## Questions & Answers

**Q: If this does not work on our travel trail is it returnable?**
A: It will it's universal

**Q: Does this fit Airstreams?**
A: I'm not sure what size the hookup is on an Austrian, but it did not fit my 27ft travel trailer, so I use it on my boat trailer instead

**Q: Can these be rekeyed?  I have alot of locks. All on same master lock key**
A: I have 6 of these they can be rekeyed. Try a different lock smith. I would also say to have it keyed with the pad locks so you always only have one key for lots of locks.

**Q: Can I get a key number the same as locks i Have**
A: It would depend on the key # needed. Please feel free to message us with the key # you are looking to match to and we can tell you if it can be done.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Solid, Simple Trailer Hitch Lock That Adds Real Peace of Mind
*by T***M on December 15, 2025*

The Master Lock 379ATPY universal trailer hitch lock is a straightforward, effective security solution that does exactly what it’s meant to do. If you’re looking for an easy way to secure a trailer without overthinking the setup, this lock delivers dependable protection with minimal hassle. Fit and compatibility are strong points. The universal design works well across different types of trailers, including RVs, utility trailers, horse trailers, and tool trailers. It fits securely over the coupler and blocks it effectively, preventing anyone from hitching up and towing off your trailer. Once installed, it’s very clear the trailer isn’t going anywhere. Build quality feels solid. The lock has a good weight to it and doesn’t feel thin or easily defeated. While no lock is completely theft-proof, this one is sturdy enough to act as a strong deterrent. It sends a clear message that the trailer is protected and not an easy target, which is often half the battle when it comes to theft prevention. Installation is quick and simple. You don’t need tools or complicated adjustments. It slides into place easily and locks securely. Removing it is just as easy when you’re ready to use the trailer, which makes it convenient for regular use without becoming annoying. The locking mechanism works smoothly. The key turns cleanly without sticking, and the lock opens and closes without feeling gritty or cheap. That’s important for something that may sit outdoors and be exposed to weather. So far, it’s held up well without signs of binding or corrosion. The black finish keeps it discreet while still looking tough and purposeful. It doesn’t draw unnecessary attention, but it’s obvious enough to let would-be thieves know the trailer is secured. It also looks clean and professional, whether the trailer is parked at home, a storage lot, or a campsite. Overall, this Master Lock trailer coupler lock is a reliable, easy-to-use security accessory that does its job well. Strong fit, solid construction, simple operation, and broad compatibility make it a smart choice for protecting trailers of all kinds. If you want added peace of mind without complexity, this is an easy five-star product.

### ⭐⭐⭐⭐⭐ Perfect Fit and Great Peace of Mind
*by S***A on December 17, 2025*

This Master Lock fits my trailer perfectly and feels very secure. It was easy to install and solidly built. Once it’s on, I feel confident that it will help prevent my trailer from being stolen. Definitely gives me peace of mind and I would recommend it to anyone looking for a reliable trailer lock.

### ⭐⭐⭐⭐⭐ Excellent Universal Lock – Highly Recommend!
*by A***T on April 24, 2025*

The Master Lock 379ATPY is a sturdy, reliable hitch lock that fits most trailers securely. The black finish resists rust, and the dual-locking mechanism provides extra theft protection. Easy to install and remove, yet tough enough to deter tampering. Great value for the price—highly recommended for peace of mind!

## Frequently Bought Together

- Master Lock 379ATPY Universal Trailer Hitch Lock , Black
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**Shop now:** [https://www.desertcart.sk/products/7757162-master-lock-black-universal-size-trailer-hitch-lock-trailer-coupler](https://www.desertcart.sk/products/7757162-master-lock-black-universal-size-trailer-hitch-lock-trailer-coupler)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-01*