Your trailer is one of your biggest investments. The CURT 23523 coupler lock drops into the coupler socket and physically blocks the latch mechanism, preventing a thief from simply slipping your trailer onto any ball hitch and driving away. It also serves as a visible deterrent -- a bright lock in the coupler tells would-be thieves to move on. Weighing just 0.5 lbs and compact enough to toss in a tow vehicle glove box, this is an easy add-on that pays for itself the first time you leave your rig unattended.
The CURT 23523 is designed to fit the three most common trailer ball sizes used in North America -- 1-7/8 inch, 2 inch, and 2-5/16 inch. That covers the vast majority of travel trailers, fifth-wheel tag trailers, boat trailers, cargo trailers, and utility trailers on the road today. One lock, one part number, broad coverage.
Installation takes seconds: open the coupler latch, insert the lock body into the coupler socket, and engage the keyed cylinder. The lock body expands or is shaped to fill the socket and prevent the coupler from closing down onto a hitch ball. No tools required, no permanent modifications to the trailer.
One lock fits 1-7/8", 2", and 2-5/16" ball couplers -- the three most common RV and trailer hitch ball diameters in the US market.
Constructed from hardened steel resistant to cutting, prying, and hammering. Resists basic hand-tool attacks that defeat cheaper zinc or aluminum locks.
Comes with a keyed lock cylinder and keys. No separate padlock needed -- everything required to secure the coupler is in the box.
Inserts directly into the open coupler socket in seconds. No drilling, no wiring, no modifications. Remove just as fast when you are ready to hitch up.
CURT offers several coupler security products. The 23523 sits in their universal coupler lock category -- a single device engineered to span the three dominant ball sizes rather than requiring size-specific purchases. If you tow multiple trailers with different coupler sizes, or if you want one lock that works across the family fleet, this is the right choice. CURT's more specialized couplers locks (such as their dedicated 2-5/16" only models) offer a tighter fit for a single size but require a separate purchase for each coupler diameter.
To install the CURT 23523: