Take your engine maintenance to the next level with the Flush-M Mercury Quick Flushing Plug Replacement, the ultimate upgrade for any Mercury Outboard. Designed specifically to permanently replace the factory OEM flush plug (Mercury part 22-888958001), the Flush-M delivers premium quality and convenience for your outboard’s cooling system making it an essential maintenance solution.
Replaces Mercury part: 22-888958001
Suits Mercury engines:
Verado, Pro XS, FourStroke and SeaPro series (75HP - 500HP)
Crafted with precision and durability, the Flush-M Mercury is built to simplify repetitive engine flushing. Its quick-connect design allows fast, secure hose attachment without removing engine covers or dealing with awkward fittings. This permanent installation saves time, prevents wear on your OEM components, and ensures a consistent freshwater flush every time.
Each kit includes a 90° swivel elbow attachment (ideal for larger V8 Mercury models) to eliminate hose kinks that can restrict water flow during the flushing process. The upgraded design provides superior water circulation and enhanced engine protection, even in demanding saltwater environments.
Direct replacement for Mercury OEM part 22-888958001
Premium aftermarket design — engineered for durability and precision fit
Permanent installation for effortless flushing and cleaner maintenance routine
90° swivel elbow prevents hose kinks and ensures unrestricted water flow
Compatible with Mercury Verado, Pro XS, FourStroke, and SeaPro outboards (75–500HP)
Available in black or white to match your engine cowling
Designed to protect against corrosion, salt buildup, and overheating
The Flush-M can be installed in minutes:
Remove the original OEM plug from the engine cowling.
Unscrew it from the 3/4" female hose receptacle and detach the lanyard.
Fit the Flush-M to the lanyard and thread it into the hose receptacle.
Lock in place with a 1/4 clockwise turn (use an 11/16" spanner if needed—do not overtighten).
Once installed, your engine is ready to be flushed anytime — simply remove the cap, connect your hose using the quick connector, flush, and refit the cap.
The Flush-M Quick Flushing Plug Replacement isn’t just a part — it’s an essential upgrade for protecting your Mercury Outboard engine. By streamlining flushing and preventing cooling issues, it extends the life of your engine and maintains peak performance for years to come. Trusted by boat owners and marine professionals worldwide, the Flush-M is the smartest investment you can make for your outboard’s longevity.
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This product is simply essential to Mercury outboards.
An excellent solution to a very common problem. Works perfectly as described and looks OEM.
Australian Dollars
