The FLUSHMASTER is a portable, marine-grade outboard flushing system designed to make multi-engine maintenance a whole lot easier. This 4-outlet controller comes equipped with four 5-foot marine-grade hose kits, making it a solid fit for tighter transom layouts where engines sit close together or near the water source.

At the push of a button, FLUSHMASTER delivers a timed freshwater flush to each engine—one at a time - so you’re not splitting water pressure across multiple motors. That means a more effective rinse through the cooling system, helping clear out salt, sand, and mineral buildup that can shorten engine life over time.

Once the cycle is complete, the system automatically shuts off and blocks water flow. No need to run the engines, no hose swapping between motors, and no babysitting the process. It’s a cleaner, more controlled way to flush your setup and keep everything running the way it should.

Key Features

• Built for Multi-Engine Boats: Designed to manage up to four outboards with a clean, automated flushing process.
• Compact Hose Configuration: Four 5-foot hose kits are ideal for close-range installations and tight engine spacing.
• Automatic Sequential Flushing: Flushes one engine at a time to maintain proper water pressure through each cycle.
• Walk-Away Operation: Start the system and let it run without monitoring each engine manually.
• Marine-Grade Construction: Waterproof housing and durable materials are built for dockside and onboard use.
• Simple Setup: No wiring, apps, or complicated plumbing required — connect hoses, press the button, and go.

*Quick Connects sold separately.

Kit Includes

• (1) FLUSHMASTER 4-Outlet Controller
• (4) 5′ Marine-Grade Hose Kits
• (8) Hose Clamps + Mini Screwdriver
• (3) AA Batteries
• Installation Guide + 1-Year Warranty

Perfect For

• Compact Multi-Engine Setups: Best for engines positioned close together.
• Quad-Outboard Boats: Flushes up to four engines without switching hoses.
• Dockside Maintenance: Makes routine flushing faster after each trip.
• Marine Technicians: Helps create a repeatable flush process for service work.
• Seasonal Storage Prep: Helps remove salt and deposits before downtime.
• Freshwater Boaters: Helps clear algae, debris, and invasive buildup from cooling passages.

Compatibility

The FLUSHMASTER is compatible with Mercury, Yamaha, Suzuki, Honda, and other four-stroke outboards with standard garden-size flush ports. Select hose length based on your engine spacing, dock layout, and water-source location.