Moeller Motor Flushers

Moeller Marine Motor Flushers: Protecting Your Engine After Every Trip

Whether you've been running through saltwater bays, brackish estuaries, or mineral-rich freshwater lakes, flushing your outboard or sterndrive after each outing is one of the most important habits a boater can build. Moeller Marine has long been recognized as a trusted name in marine fuel systems and accessories, and their lineup of motor flushers reflects the same commitment to quality construction and practical engineering that defines the brand.

The Flushrite Series: Round Cup and Rectangular Cup Designs

Moeller's motor flusher lineup — marketed under the Flushrite name — offers boaters two primary configurations to match different lower unit geometries and engine sizes:

• Universal Round Cup Motor Flusher: Designed for most outboard lower units with side water inlets, the round cup style slips quickly over the water intake ports and connects to a standard garden hose. No tools are required, and installation takes only seconds. This is an ideal solution for smaller to mid-range outboards.
• Dual Water Feed Rectangular Cup Motor Flusher: Engineered for higher-horsepower applications — including inboard and outboard lower units over 50 horsepower and select Volvo Penta sterndrives — the rectangular cup design delivers improved water flow by simultaneously feeding both sides of the lower unit cooling system. The larger cup surface area creates a better seal and more thorough flush.
• Pro Dual Feed Square Motor Flusher (Model 380160): A heavy-duty step up that features a metal yoke for added durability and clamping strength, targeting lower units over 75 horsepower. The professional-grade build suits boaters who demand a more robust flush tool for repeated seasonal use.

Why Moeller Motor Flushers Stand Out

For more than 25 years, Moeller Marine Products has been the industry standard in fuel system design and construction, with a reputation built on innovative engineering, quality construction, and award-winning service. That same DNA carries into their motor flusher line.

Moeller offers a comprehensive series of motor flushers that flush contaminants from your lower unit cooling systems, each quickly removing salt and mineral build-up with a simple flush that slips over side water inlets on most inboard and outboard lower units — installing in seconds using just a garden hose.

Moeller makes fairly high quality products, and the dual flush ensures you're getting water into both sides of the lower unit. The muffs themselves are made from very thick, heavy-duty rubber, and the connecting spring is very strong. For the Pro model, the dual water feed design offers improved water flow with rectangular cups and a heavy-duty metal yoke for added durability.

The Flushrite series is compatible with virtually all popular outboard brands — from Yamaha and Mercury to Johnson, Evinrude, and Volvo Penta — making these flushers a truly universal workshop staple. They are perfect for running an outboard motor on a trailer out of the water, and are particularly well-suited for season-ending maintenance routines.

When and Why to Flush Your Motor

Salt, sand, and mineral deposits accumulate inside outboard cooling passages with every use. Left unaddressed, these deposits corrode water pump components, clog cooling passages, and ultimately cause overheating. A quality motor flusher — used consistently after every saltwater or hard-water outing, as well as before winter storage — is a small investment that can dramatically extend engine life. Moeller's Flushrite tools make this habit effortless, requiring nothing more than a garden hose and a minute of your time.

Explore the full range of motor flushers available, or browse the complete Moeller Marine product catalog to discover their broader lineup of fuel accessories, tanks, and marine hardware.