Sierra Motor Flushers

Sierra Motor Flushers: Protecting Your Marine Engine After Every Outing

Every boater who runs in salt, brackish, or sediment-laden water knows the risk: mineral deposits and corrosive salt residue silently build up inside the engine's cooling passages, shortening engine life with each outing. Motor flushers are the simple, essential tool that stands between a well-maintained powerplant and expensive corrosion damage — and Sierra has built some of the most trusted options in the category.

Sierra has a 58-year history as a leading global manufacturer of aftermarket engine and drive parts for the marine industry. Sierra, a brand of Dometic, ensures boaters get the right marine aftermarket parts so they can get back to enjoying the water. That deep engineering heritage carries directly into Sierra's motor flusher lineup — these aren't generic accessories, but purpose-built tools designed alongside the engine parts they help protect.

Sierra's Motor Flusher Lineup

Sierra offers multiple motor flusher configurations to suit different engine types and use cases. The lineup includes both heavy-duty and standard models, as well as dual-feed and single designs with round or rectangular cup options.

• Heavy-Duty Motor Flusher (18-9895): Features high-quality EPDM rubber cups, a corrosion-resistant dichromate finish, and installs in seconds with a standard garden hose — no tools required.
• Universal Ear-Muff Style Flusher (18-9010): Flushes the cooling system of salts and sediments and allows the engine to idle for tuning and adjustment in your own driveway — simply slip the attachment over the engine's side water intakes. Coated spring steel arms clamp the suction cup securely over the engine's side water intakes.
• Dual Feed Motor Flusher with Round Cups (18-8997): Furnished with round cups for a secure, even seal around the water intake.
• Universal Rectangular Cup Flusher (18-9009): Designed for all lower units with side water inlets, including Volvo SX, and is ideal in the low-pressure conditions often found in marinas, with improved water flow thanks to rectangular cups.
• Universal Inboard Flusher (18-9009): Fits most inboard engines , extending Sierra's flushing coverage beyond outboards to sterndrive and inboard applications.

Why Choose Sierra for Engine Flushing?

Each Sierra product meets or exceeds the original equipment part it replaces. For motor flushers, this means materials and construction quality that stand up to repeated use and resist the very corrosion they're designed to fight. Backed by Sierra's industry-leading warranty, aftermarket parts meet or exceed OEM standards.

Sierra's heavy-duty motor flusher flushes the cooling system of salts and sediments, allows the engine to idle for tuning and engine adjustment in your own driveway, and simply slips over the drive's water intake passages. This convenience — combined with durable EPDM rubber cups and a metal hose connector complete with rubber washer — makes Sierra flushers a reliable part of any post-launch maintenance routine.

Whether you run a saltwater bass boat, a center console, or a family pontoon, integrating a Sierra motor flusher into your regular maintenance schedule is one of the most cost-effective ways to extend engine life and avoid costly cooling system repairs down the road. Browse the full range of Sierra marine parts or explore all available motor flushers to find the right fit for your engine.