Replacement Surge Coupler for Roadrunner Boat Trailer

Question:

I am looking for a Atwood master cylinder for a surge disc brake system. The one that was on it is #85739. It is a Roadrunner trailer built for a Hurricane boat. I havent had any luck finding one.

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Expert Reply:

Unfortunately some years back Atwood was bought out and replacement parts have been discontinued so we cannot help you with a replacement master cylinder number 85739, but we can help you with a new surge coupler to replace yours.

I linked our main page for surge couplers and we have both disc and drum types; these operate at different pressures so be sure to choose the right type for your braking system. First click on the type you need and then select the specific attributes you want such as the type of lockout (electric or manual), mounting type (bolt-on or weld-on) and of course on the weight capacity needed for your specific trailer's GVWR.

For instance, for a 6K-rated bolt-on coupler without lockout that accepts a 2-inch ball and fits a straight trailer tongue you could use # 8605001 from Demco.

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Adam R

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