Master Lock 379KA-3 Keyed Alike Universal Trailer Coupler Locks – 3-Pack with 6 Keys

Meet the Master Lock 379KA-3, a three pack of Keyed Alike Universal Trailer Coupler Locks designed for multi trailer setups. This kit is built for convenience when you manage more than one trailer or storage area, delivering a simple, practical security solution without sacrificing usability.

Key features center on a single-key convenience across all three locks, with two keys included per lock for a total of six keys. This arrangement can simplify day to day tasks for families, fleets, or individuals who handle multiple trailers. While no lock can guarantee absolute security, the design aims to streamline access and discourage opportunistic theft by creating a straightforward, repeatable keying system.

Universal fit and security

• Fits common couplers 1 7/8 in, 2 in, and most 2 5/16 in units from brands like Reese, Fulton, Valley, and more.
• When locked, the body rests on top of the coupler, adding a barrier against downward hammer strikes and reducing leverage for quick exits.
• Rotation helps reduce rigidity, making brute force attempts more challenging while remaining user friendly for everyday use.

Durable build and reliability

• Rekeyable cylinder enables convenient keyed-alike setup with an advanced locking mechanism that resists picking and prying.
• Reinforced zinc die-cast construction resists rust and corrosion while delivering high strength and better impact resistance than many alternatives.
• Each lock weighs about 2.4 lbs, delivering a substantial, sturdy feel without excessive bulk.

What you get in the box is straightforward and ready to use: three keyed-alike locks, six keys in total, and a Limited Lifetime warranty. If you need multiple packs keyed alike, the six-pack option can help maintain consistent keying across a larger setup.

Real world use includes protecting unattended trailers during stops, securing gear storage, and coordinating access across several trailers in a yard or on a job site. The design emphasizes deterrence and practical convenience, aligning with everyday security goals for trailer owners and operators.

Why choose Master Lock

Master Lock combines a long-standing reputation with practical design details that address common trailer security needs. The 379KA-3 offers compatibility, a straightforward keying system, and a solid build that can fit into many owner workflows.