---
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: "2233774₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Master Lock"
url: https://www.desertcart.vn/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7
store_origin: VN
region: Vietnam
---

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

**Brand:** master lock
**Price:** 2233774₫
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in peace of mind, unlock your freedom.

## 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?** 2233774₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/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

- • **Built to Last:** Durable brass construction resists rust and corrosion for long-term reliability.
- • **Bold Deterrent:** Bright red finish sends a clear 'hands off' message to potential thieves.
- • **Effortless Use:** Simple installation and removal means you’re protected in seconds.
- • **Unmatched Security:** Advanced locking mechanism deters thieves with pick and pry resistance.
- • **Universal Compatibility:** Fits the most common trailer coupler sizes for seamless protection.

## Overview

The Master Lock 389DAT Trailer Coupler Lock offers universal fitment for 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 body provides a bold visual deterrent and long-lasting durability. Trusted by thousands with a 4.7-star rating, it’s the go-to security upgrade for any trailer owner seeking hassle-free, reliable protection.

## 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 |
| Best Sellers Rank | #6,467 in Automotive ( See Top 100 in Automotive ) #20 in Towing Hitch Locks |
| Brand | Master Lock |
| Color | Red |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.7 4.7 out of 5 stars (17,390) |
| Date First Available | January 26, 2017 |
| Exterior | Metal |
| Finish Type | Painted |
| Global Trade Identification Number | 00071649263019 |
| Included Components | Coupler Lock |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1 pounds |
| Item dimensions L x W x H | 3.6 x 7.6 x 6.7 inches |
| Item model number | 379ATPY |
| Lock Type | Key Lock |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 389DAT |
| Material | Brass |
| Model Name | Trailer Coupler Lock |
| Number of Pieces | 1 |
| Product Dimensions | 3.6 x 7.6 x 6.7 inches |
| Recommended Uses For Product | securing trailers |
| Special Feature | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Special Features | Advanced locking mechanism, Resists picking and prying, Rekeyable |
| Style | Master Lock |
| UPC | 071649263019 |

## 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)

## 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
- 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.vn/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7](https://www.desertcart.vn/products/43811787-master-lock-trailer-coupler-lock-universal-size-fits-1-7)

---

*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-16*