---
product_id: 276055143
title: "Master Lock Universal Size Fits 1 7/8\", 2\", and 2 5/16\" Couplers Trailer Locks 389DAT, Red"
brand: "master lock"
price: "$U7131"
currency: UYU
in_stock: true
reviews_count: 5
category: "Master Lock"
url: https://www.desertcart.uy/products/276055143-master-lock-universal-size-fits-1-7-8-2-2
store_origin: UY
region: Uruguay
---

# Advanced pick-resistant lock Universal fit for 3 coupler sizes Rust & corrosion resistant finish Master Lock Universal Size Fits 1 7/8", 2", and 2 5/16" Couplers Trailer Locks 389DAT, Red

**Brand:** master lock
**Price:** $U7131
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in peace of mind, stand out with bold security.

## Quick Answers

- **What is this?** Master Lock Universal Size Fits 1 7/8", 2", and 2 5/16" Couplers Trailer Locks 389DAT, Red by master lock
- **How much does it cost?** $U7131 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/276055143-master-lock-universal-size-fits-1-7-8-2-2)

## 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

- • **Bold Red Deterrent:** Bright red finish sends a clear 'hands off' message to thieves
- • **Effortless Control:** Simple installation and rekeyable for personalized security management
- • **Next-Level Security:** Advanced locking mechanism resists picking and prying attempts
- • **Built to Brave the Elements:** Durable brass body resists rust and corrosion for long-lasting security
- • **Universal Fit, Zero Guesswork:** Fits 1-7/8", 2", & 2-5/16" trailer couplers seamlessly

## Overview

The Master Lock 389DAT universal coupler lock secures trailers with a robust brass body and advanced pick-resistant mechanism. Designed to fit the most common coupler sizes (1-7/8", 2", and 2-5/16"), its bright red finish deters theft while resisting rust and corrosion. Easy to install and rekeyable, it’s the trusted choice for professionals who demand reliable, visible trailer security.

## Description

Coupler Lock, Lock Type Universal, For Use With Automotive and Towing, Trailers, Vans and Moving Trucks, Features Resist Rust and Corrosion

Review: Good and Safe
Review: They look great.

## Features

- Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers
- Bright red finish discourages thief's from messing with your trailer
- Resists rust and corrosion. Simple installation and removal
- Advanced locking mechanism resists picking and prying

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MYCT0LG |
| Additional Features | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Brand | Master Lock |
| Brand Name | Master Lock |
| Color | Red |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.6 out of 5 stars 16,531 Reviews |
| Finish Types | Painted |
| Global Trade Identification Number | 00071649263019 |
| Included Components | Coupler Lock,Universal |
| Item Dimensions | 9.1 x 19.3 x 17 centimeters |
| Item Type Name | Automotive Towing |
| Item Weight | 454 g |
| Item dimensions L x W x H | 9.1 x 19.3 x 17 centimeters |
| Lock Type | Key Lock |
| Lock type | Key Lock |
| Manufacturer | Master Lock |
| Material | Brass |
| Material Type | Brass |
| Model Number | 379ATPY |
| Recommended Uses For Product | securing trailers during transportation or storage |
| Recommended uses for product | securing trailers during transportation or storage |
| Shape | Rectangular |
| Special features | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Style Name | Master Lock |
| UPC | 071649263019 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Master Lock
- **Item dimensions L x W x H:** 3.6 x 7.6 x 6.7 inches
- **Lock Type:** Key Lock
- **Material:** Brass
- **Special Feature:** Advanced locking mechanism, Resists picking and prying, Rekeyable

## Images

![Master Lock Universal Size Fits 1 7/8", 2", and 2 5/16" Couplers Trailer Locks 389DAT, Red - Image 1](https://m.media-amazon.com/images/I/51j0ElX2eTL.jpg)
![Master Lock Universal Size Fits 1 7/8", 2", and 2 5/16" Couplers Trailer Locks 389DAT, Red - Image 2](https://m.media-amazon.com/images/I/61ZBFNGmumL.jpg)
![Master Lock Universal Size Fits 1 7/8", 2", and 2 5/16" Couplers Trailer Locks 389DAT, Red - Image 3](https://m.media-amazon.com/images/I/71nmXREL0DL.jpg)

## Available Options

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

## Questions & Answers

**Q: Which is better, this or a boot for a trailer?**
A: This is pretty good, fits any receiver and is sturdy.  I also have a boot, one that clamps on each side of the wheel, so much easier to use than the so called Denver Boot.  If someone wants your trailer bad enough locks and boots won't make any difference, but it sure will slow them down.

**Q: Are the keys universal or unique to each lock?**
A: The keys are unique to the lock. I ordered the 4 pack. The keys for one lock only works on that lock.

**Q: How many keys does this come with?**
A: That would be two

**Q: Will this lock work on a gooseneck trailer 2 5/16  hitch receiver?**
A: Yes, it works on mine, and the description of it states the sizes it will fit.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good and Safe
*by S***E on 21 October 2025*



### ⭐⭐⭐⭐⭐ They look great.
*by P***S on 24 January 2025*



### ⭐⭐⭐⭐⭐ Excelente candado para remolque
*by R***E on 27 September 2025*



## Frequently Bought Together

- Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT
- CZC AUTO Black Trailer Hitch Coupler Lock, Dia 1/4 Inch, 3/4 Inch Span for Tow Boat RV Truck Car's Coupler (1 Pack, Black)
- CARTMAN Heavy Duty Trailer Lock Wheel Clamp, Universal Security Tire Lock, Adjustable Anti Theft Lock for Trailers SUV Boats ATVs Motorcycles Golf Cart

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.uy/products/276055143-master-lock-universal-size-fits-1-7-8-2-2](https://www.desertcart.uy/products/276055143-master-lock-universal-size-fits-1-7-8-2-2)

---

*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-20*