# Coupler lock MASTER LOCK Universal trailer coupler lock Silver Flat key

**URL:** https://aio.lv/en/product--masterlock-377eurdat--6832395
**Data updated:** 2026-01-06 11:17 (EET)
**Category:** Home & DIY Accessories
**Manufacturer:** MASTERLOCK
**Manufacturer code:** 377EURDAT
**EAN:** 3520190922793
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 41.49 €
**Prices and availability valid until:** 2026-07-06 23:59
**Price without VAT (21%):** 34.29 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--masterlock-377eurdat--6832395

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

The MASTER LOCK Universal trailer coupler lock is designed to secure your trailer with a durable silver finish. It features a flat key lock mechanism for added security. Ideal for protecting your trailer from theft, this coupler lock is a reliable choice for any trailer owner.

## Long description

The MASTER LOCK No. 377EURDAT is a universal trailer coupler lock with a silver finish and a flat key mechanism, designed to secure common trailer couplers. It fits 48 mm, 51 mm and most 59 mm couplers and incorporates a locking mechanism engineered to resist picking, prying, rust and corrosion. The product is backed by a Limited Lifetime Warranty from the manufacturer.
Advantages
The lock fits multiple common coupler diameters, uses a flat key for operation, and is constructed to resist picking and prying. Its surface finish helps resist rust and corrosion, and the design allows straightforward installation and removal.
Suitable for
Securing trailers with 48 mm couplers
Securing trailers with 51 mm couplers
Securing trailers with most 59 mm couplers
Owners who prefer a flat key locking mechanism
Key specifications
Brand: MASTER LOCK
Model / MPN: 377EURDAT
EAN: 3520190922793
Compatible coupler diameters: 48 mm, 51 mm, most 59 mm
Lock type: Flat key mechanism
Colour: Silver
Corrosion resistance: Yes (resists rust and corrosion)
How to use
Place the coupler lock into the trailer coupler opening so the lock body spans the coupler throat, then insert and turn the flat key to engage the locking mechanism. Verify the lock is securely seated and the key removes only after full engagement. To remove, insert the flat key, turn to unlock and withdraw the lock from the coupler.
Usage recommendations
The lock is intended for use on compatible trailer couplers (48 mm, 51 mm and most 59 mm). Regularly inspect the lock for signs of wear or corrosion and lubricate the keyway periodically according to manufacturer instructions to maintain smooth operation.

## Specifications

| Feature | Value |
|---|---|
| Easy to install | Yes |
| Lock type | Flat key |
| Product type | Coupler lock |
| Easy to remove | Yes |
| Best uses | Trailer, Truck |
| Corrosion resistant | Yes |
| Compatible trailer coupler holes | 48, 51, 59 |
| Number of lock keys included | 2 pc(s) |

### Design

| Feature | Value |
|---|---|
| Product colour | Silver |

## FAQ

### How much does the Coupler lock MASTER LOCK Universal trailer coupler lock cost, and is it available for purchase?

The price is 41.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 18 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 22.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All MASTERLOCK products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized MASTERLOCK service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/6832395/59443679_large.webp