Replacement Straight Coupler for 3"x3-14" Surge Brake Actuator

Updated 08/25/2026 | Published 08/18/2026

Question:

Hi, I’m trying to replace a trailer coupler on a boat trailer that was a surge brake coupler with a regular non surge. The brakes on the trailer are gone and disconnected already. The inner diameter square tube the coupler must slide into is 3” wide x 3-1/4H, The pins are 3.5” apart, with 1.5”h difference with the rear pin being higher. I’ve attached a picture below. Ball is 2”. Are there any options for this? Thanks, Corey

asked by: Corey K

Expert Reply:

Hey Corey!

Thanks for all of those measurements. I checked through the coupler options we carry, and unfortunately we do not have a standard non-surge coupler that will slide into your existing 3" wide x 3-1/4" tall opening and reuse the 3-1/2" staggered pin spacing.

The unusual part of your setup is really the mounting style from the old surge actuator. Most standard couplers are designed to fit over the trailer tongue rather than slide inside the existing actuator housing, and their mounting holes are generally straight across instead of offset vertically like yours.

Since your brakes are already removed and disconnected, the best option would be to remove the old surge actuator and install a conventional coupler directly over the trailer tongue. If the tongue itself is 3" wide, something like the etrailer Straight-Tongue Coupler # CT-5003-Z would work with your existing 2" hitch ball, but you would need to drill new mounting holes rather than reuse the existing ones.

Another possibility, if the old actuator housing is still structurally sound, would be to permanently lock out the sliding portion and continue using the existing coupler as a fixed coupler.

Could you send me a picture of the trailer tongue with the surge actuator removed, or let me know the outside width and height of the actual tongue underneath it? That would let me narrow down the best replacement option for you.

expert reply by: Jerry B