--- product_id: 43811787 title: "Trailer Coupler Lock, Universal Size Fits 1-7/8\", 2\", and 2-5/16\", 389DAT" brand: "master lock" price: "599 kr" currency: DKK in_stock: true reviews_count: 13 category: "Master Lock" url: https://www.desertcart.dk/products/43811787-trailer-coupler-lock-universal-size-fits-1-7-8-2 store_origin: DK region: Denmark --- # Advanced pick & pry resistant lock Universal fit for 3 coupler sizes Rust & corrosion resistant alloy steel Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT **Brand:** master lock **Price:** 599 kr **Availability:** ✅ In Stock ## Summary > 🔐 Lock in your trailer’s safety and leave thieves locked out! ## Quick Answers - **What is this?** Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT by master lock - **How much does it cost?** 599 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/43811787-trailer-coupler-lock-universal-size-fits-1-7-8-2) ## 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 - • **Built to Outlast:** Durable alloy steel resists rust and corrosion for long-term protection - • **Next-Level Security:** Advanced locking mechanism engineered to resist picking and prying - • **Red Alert for Thieves:** Bright red finish acts as a bold visual deterrent - • **Hassle-Free Peace of Mind:** Simple installation plus a Limited Lifetime Warranty from Master Lock - • **Universal Fit, Zero Guesswork:** Fits 1-7/8", 2", and 2-5/16" trailer couplers seamlessly ## Overview The Master Lock 389DAT Trailer Coupler Lock offers universal compatibility with the three most common coupler sizes, featuring a bright red, rust-resistant alloy steel body and an advanced locking mechanism designed to resist picking and prying. Trusted by professionals and backed by a Limited Lifetime Warranty, it combines high security with easy installation to protect your trailer from theft. ## 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: High quality, great price, fits variety of trailer ball szes - Master brand is known for high quality, which usually comes with higher price than competitors. Lots of research done to find a very solid lock for new camper trailer. This lock was reasonably priced, in line with other 'foreign'-named options. Lock arrived quickly AND much better theft protection than a lock through the trailer latching mechanism. Review: Lock - Love the functionality and safety ## 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 | #8,526 in Automotive ( See Top 100 in Automotive ) #25 in Towing Hitch Locks | | Brand Name | Master Lock | | Color | Red | | Control Method | Touch | | Controller Type | Hand Control | | Customer Reviews | 4.7 4.7 out of 5 stars (17,407) | | 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 | 1 Pounds | | 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 Type | Alloy Steel | | Model Number | 379ATPY | | Recommended Uses For Product | securing trailers | | 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:** Alloy Steel - **Special Feature:** Advanced locking mechanism, Resists picking and prying, Rekeyable ## Images ![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 ### ⭐⭐⭐⭐⭐ High quality, great price, fits variety of trailer ball szes *by J***S on March 2, 2026* Master brand is known for high quality, which usually comes with higher price than competitors. Lots of research done to find a very solid lock for new camper trailer. This lock was reasonably priced, in line with other 'foreign'-named options. Lock arrived quickly AND much better theft protection than a lock through the trailer latching mechanism. ### ⭐⭐⭐⭐⭐ Lock *by J***E on February 28, 2026* Love the functionality and safety ### ⭐⭐⭐⭐⭐ 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! ## 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.dk/products/43811787-trailer-coupler-lock-universal-size-fits-1-7-8-2](https://www.desertcart.dk/products/43811787-trailer-coupler-lock-universal-size-fits-1-7-8-2) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-22*