---
product_id: 43811787
title: "Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8\", 2\", and 2-5/16\", 389DAT"
brand: "master lock"
price: "B/.123"
currency: PAB
in_stock: true
reviews_count: 8
category: "Master Lock"
url: https://www.desertcart.com.pa/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7
store_origin: PA
region: Panama
---

# Advanced pick & pry resistant lock Universal fit for 1-7/8", 2", 2-5/16" couplers Rust & corrosion resistant brass build Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT

**Brand:** master lock
**Price:** B/.123
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in your trailer’s safety and leave worry behind!

## Quick Answers

- **What is this?** Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT by master lock
- **How much does it cost?** B/.123 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7)

## 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

- • **Lifetime Peace of Mind:** Backed by Master Lock’s Limited Lifetime Warranty—security that lasts a lifetime.
- • **Built to Brave the Elements:** Durable brass construction resists rust and corrosion for long-lasting defense.
- • **Next-Level Theft Deterrence:** Bright red finish screams 'protected' and wards off opportunistic thieves.
- • **Effortless Security, Anytime:** Simple slide-on installation and removal means no hassle locking on the go.
- • **Universal Fit, Zero Guesswork:** Fits 3 most popular trailer coupler sizes for seamless security.

## Overview

The Master Lock 389DAT Trailer Coupler Lock offers universal compatibility with 1-7/8", 2", and 2-5/16" couplers, featuring an advanced locking mechanism that resists picking and prying. Its bright red, rust-resistant brass finish deters theft while ensuring durability. Easy to install and backed by a Limited Lifetime Warranty, it’s the trusted choice for securing trailers and RVs with confidence.

## Description

The Master Lock No. 389DAT features a universal trailer coupler lock, designed to fit most 1-7/8in (48mm), 2in (51mm) and, 2-5/16in (59mm) 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: Good and Safe - Works well, good deterrence for keeping your trailers safe.
Review: Great Lock for Trailer Security! - I bought the Master Lock Universal Trailer Coupler Lock, and it's been a great addition to my RV setup. It fits perfectly on my 2-inch coupler. It’s solid, durable, and provides that extra layer of security when I’m parked at campgrounds or when my trailer’s stored. The lock is easy to use—just slide it on, lock it in place, and I feel much more confident leaving the trailer behind. It’s made of heavy-duty materials, so I’m not worried about it rusting or breaking. Overall, this Master Lock is a great value for the price and provides peace of mind that my trailer is secure. I highly recommend it to anyone with a trailer or RV!

## Features

- Coupler Lock,Universal
- Bright red finish discourages thief's from messing with your trailer
- Advanced locking mechanism resists picking and prying
- Resists rust and corrosion; Simple installation and removal

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MYCT0LG |
| Additional Features | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Best Sellers Rank | #3,186 in Automotive ( See Top 100 in Automotive ) #10 in Towing Hitch Locks |
| Brand | Master Lock |
| Brand Name | Master Lock |
| Color | Red |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.7 out of 5 stars 17,380 Reviews |
| Finish Types | Painted |
| Global Trade Identification Number | 00071649263019 |
| Included Components | Coupler Lock |
| Item Dimensions | 3.6 x 7.6 x 6.7 inches |
| Item Type Name | Automotive Towing |
| Item Weight | 16 ounces |
| Item dimensions L x W x H | 3.6 x 7.6 x 6.7 inches |
| Lock Type | Key Lock |
| Manufacturer | Master Lock |
| Manufacturer Warranty Description | MASTER LOCK PRODUCT WARRANTY Limited Lifetime Warranty Master Lock Company LLC (“Master Lock”) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlo… |
| Material | Brass |
| Material Type | Brass |
| Model Number | 379ATPY |
| Recommended Uses For Product | securing trailers |
| Special Feature | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Style Name | Master Lock |
| UPC | 071649263019 |
| Unit Count | 1.0 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 Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT - Image 1](https://m.media-amazon.com/images/I/51j0ElX2eTL.jpg)
![Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT - Image 2](https://m.media-amazon.com/images/I/61ZBFNGmumL.jpg)
![Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT - 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 October 21, 2025*

Works well, good deterrence for keeping your trailers safe.

### ⭐⭐⭐⭐⭐ Great Lock for Trailer Security!
*by J***E on November 24, 2024*

I bought the Master Lock Universal Trailer Coupler Lock, and it's been a great addition to my RV setup. It fits perfectly on my 2-inch coupler. It’s solid, durable, and provides that extra layer of security when I’m parked at campgrounds or when my trailer’s stored. The lock is easy to use—just slide it on, lock it in place, and I feel much more confident leaving the trailer behind. It’s made of heavy-duty materials, so I’m not worried about it rusting or breaking. Overall, this Master Lock is a great value for the price and provides peace of mind that my trailer is secure. I highly recommend it to anyone with a trailer or RV!

### ⭐⭐⭐⭐⭐ Perfect, affordable, secured
*by N***S on April 22, 2024*

The Master Lock Trailer Tongue Lock is a solid choice for securing your trailer. Its sturdy build and durable materials ensure quality and longevity. The lock provides excellent security, deterring potential thieves with its robust design and tamper-resistant features. Plus, its ease of use makes securing your trailer hassle-free, allowing for quick installation and removal. Overall, it's a dependable option for safeguarding your valuable cargo on the road. I’m going to buy more for my other trailers!

## Frequently Bought Together

- Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT
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**Shop now:** [https://www.desertcart.com.pa/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7](https://www.desertcart.com.pa/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-18*