---
product_id: 7757162
title: "Master Lock Trailer Lock, Black Trailer Tongue Lock 379ATPY"
brand: "master lock"
price: "HK$600"
currency: HKD
in_stock: true
category: "Master Lock"
url: https://www.desertcart.hk/products/7757162-master-lock-trailer-lock-black-trailer-tongue-lock-379atpy
store_origin: HK
region: Hong Kong
---

# Advanced pick & pry resistant lock Rust & corrosion-resistant zinc build Universal fit for 3 common coupler sizes Master Lock Trailer Lock, Black Trailer Tongue Lock 379ATPY

**Brand:** master lock
**Price:** HK$600
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in your trailer’s safety, unlock your peace of mind.

## Quick Answers

- **What is this?** Master Lock Trailer Lock, Black Trailer Tongue Lock 379ATPY by master lock
- **How much does it cost?** HK$600 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/7757162-master-lock-trailer-lock-black-trailer-tongue-lock-379atpy)

## 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

- • **Ready Out of the Box:** Includes two keys for convenient access and backup security.
- • **Unmatched Theft Deterrence:** Blocks unauthorized trailer coupling with a visible, high-security lock.
- • **Built to Brave the Elements:** Durable zinc construction resists rust and corrosion for long-lasting outdoor use.
- • **Fits Most Trailers Seamlessly:** Compatible with 1-7/8", 2", and 2-5/16" couplers for versatile towing setups.
- • **Trusted Brand, Proven Reliability:** Master Lock’s 4.6-star rated security solution for peace of mind on every trip.

## Overview

The Master Lock 379ATPY Trailer Tongue Lock is a universal, zinc-constructed coupler lock designed to secure trailers, RVs, and towing equipment by preventing unauthorized hitching. It fits the three most common coupler sizes, features an advanced pick- and pry-resistant locking mechanism, and includes two keys. Engineered for outdoor durability, it resists rust and corrosion, making it ideal for use at home, campsites, marinas, and jobsites.

## Description

Protect your trailer with the Master Lock 379ATPY Universal Trailer Coupler Lock, a practical towing security solution designed to help prevent unauthorized coupling when your trailer is parked, stored, or left unattended. Built for shoppers looking for a trailer hitch lock that is simple, visible, and compatible with common coupler sizes, this lock helps secure utility trailers, enclosed trailers, RVs, campers, boat trailers, and other towable equipment. This universal design fits 1-7/8 in. (48 mm), 2 in. (51 mm), and most 2-5/16 in. (59 mm) trailer couplers, covering many of the most common towing applications. The coupler lock helps add protection at home, on the road, at a campsite, near a marina, or on a jobsite where trailers may sit unattended between uses. The advanced locking mechanism is engineered to resist picking and prying, giving trailer owners a reliable way to help deter theft and unwanted hitching. Its zinc construction helps resist rust and corrosion for outdoor performance, making it a strong choice for anyone searching for a boat trailer lock, camper hitch lock, RV hitch lock, trailer tongue lock, or lock for trailer hitch security. Compact and easy to keep with your trailer hitch accessories, this keyed trailer coupler lock includes two keys so you can store a spare where it is convenient. Whether you are securing a trailer between weekend trips, protecting equipment during seasonal storage, or adding a visible theft deterrent to your towing setup, the Master Lock 379ATPY offers dependable trailer security from a brand known for trusted locking products.

## Features

- SECURE TRAILERS, RVS AND TOWING EQUIPMENT: This Master Lock trailer coupler lock helps deter theft by blocking unauthorized coupling, making it a dependable trailer hitch lock for parked trailers, RVs, campers, boat trailers, and utility trailers.
- UNIVERSAL FIT FOR COMMON COUPLER SIZES: Designed to fit 1-7/8 in. (48 mm), 2 in. (51 mm), and most 2-5/16 in. (59 mm) trailer couplers, this trailer tongue lock gives shoppers one versatile solution for multiple towing setups.
- ADVANCED LOCKING SECURITY: The locking mechanism is engineered to resist picking and prying with visible, keyed trailer coupler protection.
- RUST AND CORROSION-RESISTANT ZINC BUILD: Durable zinc construction helps this trailer hitch coupler lock stand up to outdoor storage, changing weather, boat ramps, campsites, jobsites, and everyday driveway use.
- READY TO USE WITH TWO KEYS: Includes one universal trailer coupler lock and two keys, giving you a complete keyed hitch lock solution for securing towing equipment between trips, during storage, or when your trailer is unattended.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000L9QRE8 |
| Additional Features | Anti-Corrosion, Cut Resistant, Weather Resistant |
| Best Sellers Rank | #1,041 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 |

## 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:** Anti-Corrosion, Cut Resistant, Weather Resistant

## Images

![Master Lock Trailer Lock, Black Trailer Tongue Lock 379ATPY - Image 1](https://m.media-amazon.com/images/I/81Vk0Qx964L.jpg)

## Available Options

This product comes in different **Style** options.

## 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.

## Frequently Bought Together

- Master Lock 379ATPY Universal Trailer Hitch Lock , Black
- MAXXHAUL 70472 Solid Rubber Heavy Duty Black Wheel Chock 2-Pack, 8" x 4" x 6"
- RETRUE Trailer Tongue Coupler Lock, Trailer Hitch Lock,Dia 1/4 Inch, 3/4 Inch Span for Tow Boat RV Truck Car's Coupler, Black

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**Shop now:** [https://www.desertcart.hk/products/7757162-master-lock-trailer-lock-black-trailer-tongue-lock-379atpy](https://www.desertcart.hk/products/7757162-master-lock-trailer-lock-black-trailer-tongue-lock-379atpy)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-09-16*