Outboard Flush Kit for Mercury, Suzuki & Yamaha Outboards – Replaces GHmarine 50-18411
Outboard Flush Kit for Mercury, Suzuki & Yamaha Outboards – Replaces GHmarine 50-18411 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Outboard Flush Kit for Mercury, Suzuki & Yamaha Outboards – Rep...
Outboard Flush Kit for Mercury, Suzuki & Yamaha Outboards – Replaces GHmarine 50-18411 is backordered and will ship as soon as it is back in stock.
Product Details
This outboard flush kit for Mercury, Suzuki, and Yamaha outboards provides a convenient way to flush an engine's cooling system with fresh water. Regular flushing can help remove salt, sand, silt, and other contaminants from the cooling passages and reduce the buildup that may contribute to corrosion or restricted water flow.
The kit is designed for outboard motors equipped with a compatible screw-in flush port and is listed as a replacement for GHmarine part number 50-18411. Always compare the engine's flush-port thread and connection style with the product images before ordering.
- Screw-in flush adapter with a quick-connect fitting for convenient setup.
- Connects to a standard garden hose through the included hose connection collar.
- Suitable for compatible Mercury, Mariner, Suzuki, and Yamaha outboards with a screw-in flush port.
- Aftermarket replacement kit for routine cooling-system flushing.
Part Number Matrix
The reference below identifies the aftermarket replacement relationship documented for this product. It is not a statement that every outboard using this reference will have the same flush-port configuration.
| Brand | Part Number |
|---|---|
| GHmarine | 50-18411 |
Engine & Model Compatibility
This flush adapter is intended for compatible Mercury, Mariner, Suzuki, and Yamaha outboard motors equipped with a screw-in flushing port. Specific model, horsepower, year, shaft-length, and serial-number ranges were not established in the available product records, so compatibility should be confirmed from the engine's original flush fitting before purchase.
This product is not intended for engines that require an external ear-muff-style flushing device instead of a screw-in flush adapter. Do not force the fitting if the thread or connection does not match.
Technical Specs
- Product Type
- Outboard motor flush kit
- Installation
- Screw-in adapter with quick-connect fitting
- Connection
- Garden hose connection with collar
- Application
- Compatible Mercury, Mariner, Suzuki, and Yamaha outboards with a screw-in flush port
- Fitting Type
- Screw-in flush adapter
- Color
- Black and red, as shown in the product presentation
- Reference Replacement
- GHmarine 50-18411
- Product Status
- Aftermarket replacement
What’s in the Box
- 1 x Outboard flush kit with screw-in adapter and quick-connect hose fitting
Installation Notes
- Make sure the engine is switched off and cool before beginning.
- Locate the threaded flush port on the side of the outboard motor.
- Remove the protective cap from the flush port.
- Check that the adapter thread matches the engine port, then screw the adapter in by hand until snug. Do not overtighten.
- Connect a standard garden hose to the adapter's quick-connect fitting.
- Turn on the water supply and check the connection points for leaks.
- If the engine manufacturer permits running the engine while flushing, start it only after water is flowing and let it run at idle speed. Confirm that water is exiting the tell-tale outlet.
- Important: Turn the engine off before shutting off the water supply.
- Turn off the water supply.
- Disconnect the garden hose, unscrew the adapter, and reinstall the engine's flush-port cap.
Troubleshooting & FAQ
How do I know if this will fit my specific engine model?
This kit is intended for many Mercury, Mariner, Suzuki, and Yamaha outboards with a compatible screw-in flush port. Because model and year coverage is not specified in the available records, compare the adapter and thread style with your original fitting before ordering. If your engine requires an external ear-muff-style flusher, this kit is not the correct type.
Can I run the engine at high RPM while flushing?
No. If the engine manufacturer permits engine operation during hose flushing, run it only at idle speed. Running at higher RPM without the normal load of the boat in the water can cause engine damage.
How often should I flush my outboard?
Flushing with fresh water after use in saltwater is a common maintenance practice. For freshwater use, periodic flushing can help remove silt, mud, and algae. Follow the engine manufacturer's maintenance instructions for the recommended procedure and duration.
What are the signs of a failing or clogged cooling system?
Possible signs include overheating, a weak or absent stream from the tell-tale water outlet, or steam from the engine. If these symptoms occur, stop operation and inspect the water pump, impeller, cooling passages, and related fittings before using the engine again.
Is this an OEM part or an aftermarket equivalent?
This listing is for an aftermarket replacement flush kit, not an original-equipment component. The documented replacement reference is GHmarine 50-18411. Confirm the physical connection and thread compatibility with your original part before installation.
How fast is shipping and what does it cost?
Available shipping methods, delivery estimates, and shipping charges are shown at checkout based on the destination and service selected.
Safety & Important Info
- Verify the adapter thread, connection style, and product images against your original flush port before ordering.
- Do not install or operate the adapter if the fitting does not screw in smoothly or leaks after proper hand-tightening.
- Follow the engine manufacturer's flushing instructions, including whether the engine may be run on a hose.
- Never run the engine without an adequate water supply.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine marine maintenance and repair.
- Fitment-Focused Listings — Product information is organized to help you compare connection types and reference numbers before ordering.
- Support for Maintenance Projects — Choose the correct component for your application and follow the manufacturer's installation and safety instructions.
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