Funmit 1 Pack Universal Coupler Ball Trailer Lock, Yellow

If you tow trailers, campers or utility trailers, protecting the coupler from unauthorized hookup is one of the simplest ways to deter theft. This bright yellow Funmit coupler lock combines a hardened U-pin, an 11-position ratchet for precise fit, and corrosion-resistant materials so it can be used outdoors year-round. It arrives ready to install with two matching keys and is designed for quick one-person operation.

How does this lock fit different trailer couplers?

The Funmit coupler lock is built to work with the three most common ball sizes: 1-7/8", 2", and 2-5/16". An 11-position ratchet inside the housing lets you tighten the mechanism to eliminate play and achieve a snug, secure fit across those sizes. No adapters are required—just set the ratchet position that matches your coupler profile.

• Adjustable 11-position ratchet for a tight fit
• Compatible with 1-7/8", 2" and 2-5/16" coupler types
• No separate adapters or tools needed for sizing

What materials and anti-theft features does it use?

This lock uses heavy-duty A36 steel components combined with aluminum alloy parts where weight and corrosion resistance matter. The U-shaped anti-theft pin resists common attack methods such as picking, prying and drilling, and the bright yellow finish increases visibility so would-be thieves are less likely to target your trailer.

• Solid A36 steel for strength and durability
• Aluminum alloy elements to reduce rust and weight
• U-shaped shackle resists prying and drilling attempts

How easy is it to install and use on the road?

Installation is straightforward and takes about a minute: place the lock body over the coupler, insert the U-pin, then turn the key and set the ratchet to secure the fit. Each package contains two keys matched to the single lock so you can store a spare. The simple turn-key operation makes locking and unlocking fast during brief stops or long-term storage.

• One-person, tool-free installation in under a minute
• Includes two matched keys for convenience
• Turn-key plus ratchet action for quick secure engagement

What warranty and support are included?

Funmit backs this product with a customer-focused support policy for the first 180 days after purchase. If you experience fit or quality issues during that period, contact Funmit's support team for help with resolution, replacement or guidance. The straightforward policy is designed to give buyers confidence when protecting expensive trailers and equipment.

• 180-day support period for fit or quality concerns
• Direct customer assistance from Funmit if problems arise
• Simple returns or replacement handled through Funmit support

Who is this for? The Funmit universal coupler ball trailer lock is aimed at trailer owners, seasonal campers, landscapers and contractors who want a visible, durable and adjustable hitch lock to prevent unauthorized hookups. It suits anyone with common coupler ball sizes who needs a no-fuss, weather-resistant lock they can install quickly and rely on during storage, transport or roadside stops.