What Replacement Filler Cap do I Need for a Model 10 Surge-O-Matic Brake Actuator?

Updated 05/27/2026 | Published 05/19/2026

Question:

I have a 2001 Sport boat trailer with a Model 10 Surge-O-Matic brake actuator. 10,000 gross load and 800 tongue capacity. Im missing the plastic filler cap. Do you carry this part that is compatible for this model? Thanks!

asked by: John G

Expert Reply:

Hello John,

Thanks for writing in.

Based on my research, the Replacement Black Plastic Filler Cap for Dexter 7,500-lb Brake Actuators # T097-022-00 should work with your Model 10 Surge-O-Matic actuator on your 2001 Sport boat trailer. I attached an image with the measurements of the cap, and I would just recommend double checking the dimensions of your reservoir opening to confirm it matches up before ordering since some of the older actuators had slight variations over the years.

If your actuator still has the original master cylinder and reservoir, this cap is very likely the correct replacement. It threads directly into the reservoir opening and helps keep moisture and debris out of the brake fluid, which is especially important on boat trailers that see regular water exposure.

expert reply by: Kate F