Which InfiniteRule Lock Fits Cast Demco Brake Actuator

Updated 10/21/2026 | Published 10/18/2026

Question:

Hi, Which lock will fit this Demco see attached pic. Thx

asked by: K. B

Demco Coupler
(click to enlarge)

Expert Reply:

Hey K, thanks for the picture! That is a cast Demco coupler so you need the InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers # IR66FR. This works with both 2" and 2-5/16" models.

What kind of trailer do you have?

expert reply by: Robin H

InfiniteRule Lock
(click to enlarge)

Jim M.

10/20/2026

My lock works perfectly on my Aluma car hauler. No other lock works.

Robin H.

10/21/2026

@JimM glad to hear the InfiniteRule lock fits your Aluma car hauler so well! Those cast Demco couplers can be tricky to find a compatible lock for, so it's good to hear this one has worked out for you.

10/21/2026

Yes, this lock will work on this coupler. Although it is not heavy-duty, just basic lock. If your looking for high security, I'd look for one that covers the whole head of the hitch. This has worked for me with locking to the vehicle.