Trailer Hitch Pin Lock for Treg Coupling – 6mm Zinc-Plated Security Lock with Keys (SKU: MTCP1407)

The MTCP1407 Trailer Hitch Pin Lock is a compact but effective security solution for Treg-style poly block trailer couplings. Designed with a 6mm diameter pin, this lock inserts into the coupling head to prevent unauthorised hitching, helping protect your trailer from theft while parked.

Why is this important? If you leave your Treg coupling head empty, a thief could easily reverse a car with the right bracket, insert a pin, and tow away your trailer in seconds. This lock closes that loophole with minimal effort and maximum peace of mind.

Built with a zinc-plated body for corrosion resistance and supplied with two keys, it’s a practical and lightweight lock you’ll want to keep on hand wherever your trailer is stored.

Key Features:

• 6mm diameter pin – fits most Treg poly block couplings and other 6mm locking holes
• Zinc-plated finish – resists rust and wear
• Secure barrel-style lock – includes 2 keys
• Simple and quick to install
• Ideal for trailers, camper trailers, and off-road rigs with Treg couplings

Use it after you unhitch — just insert it into the coupling where your pin would go and lock it up. It’s that simple to deter an opportunistic thief.