Outboard Motor Quick-Connect Flush Kit for Select Mercury, Mariner, Yamaha and Suzuki Outboards – Replaces Seachoice 50-18411
Outboard Motor Quick-Connect Flush Kit for Select Mercury, Mariner, Yamaha and Suzuki Outboards – Replaces Seachoice 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 Motor Quick-Connect Flush Kit for Select Mercury, Mariner,...
Outboard Motor Quick-Connect Flush Kit for Select Mercury, Mariner, Yamaha and Suzuki Outboards – Replaces Seachoice 50-18411 is backordered and will ship as soon as it is back in stock.
Product Details
This Outboard Motor Quick-Connect Flush Kit provides a convenient way to flush an outboard engine's cooling system with fresh water. It is intended for select Mercury, Mariner, Yamaha and Suzuki outboards equipped with a compatible screw-in flushing port.
The kit replaces the original flush-port plug and provides a quick-connect hose connection for easier routine flushing. It is listed as a replacement for Seachoice 50-18411 and may also be cross-referenced with XCWT and JLM MARINE outboard flush-kit descriptions. Always verify the flushing-port thread and connection style before ordering.
- Screws into a compatible engine flushing port.
- Connects to a standard garden hose through the quick-connect fitting.
- Includes the male valve/nipple and female quick-connect components.
- Designed for convenient repeated flushing without removing the installed male fitting each time.
Part Number Matrix
The references below are provided for cross-reference purposes. They do not replace confirmation of the engine's flushing-port specifications.
| Brand or Source | Reference |
|---|---|
| Seachoice | 50-18411 |
| Mercury | 22-888958001 |
| XCWT | Outboard Engine Quick Connect Flush Kit |
| JLM MARINE | Outboard Flush Kit |
Engine and Model Compatibility
This aftermarket flush kit is described for select Mercury/Mariner, Yamaha and Suzuki outboards with a compatible flushing port. Model coverage can vary by year, engine configuration and port design, so verify the original plug, thread and fitting before installation.
| Brand | Model or Series Examples | Rated HP Range Listed | Stroke | Reference | Fitment Condition |
|---|---|---|---|---|---|
| Mercury / Mariner | Verado, Pro XS, FourStroke, SeaPro | 75–500 HP | 4-Stroke | 22-888958001 | Requires a compatible flushing port |
| Yamaha | Offshore, V MAX SHO and XTO Offshore | 8–425 HP | 4-Stroke | — | Port and model-specific verification required; some 115 HP applications may be excluded |
| Suzuki | Selected 4-Stroke outboards | 8–350 HP | 4-Stroke | — | Requires a compatible flushing port |
Horsepower ranges and model names are general application guidance rather than confirmation for every engine within a range. Compare the original flush plug and confirm the port specification before purchase.
Technical Specifications
- Product Type
- Outboard engine quick-connect flush kit
- Installation
- Screw-in replacement for a compatible engine flushing-port plug
- Connection
- Quick-connect fitting compatible with a standard garden hose
- Housing Material
- Acrylonitrile butadiene styrene (ABS)
- Housing Color
- Gray
- Listed Dimensions
- 61 × 38 × 36 mm (approximately 2.4 × 1.5 × 1.42 in); package dimensions as listed
- Listed Weight
- 0.05 kg (approximately 1.76 oz)
- Connector Type
- Nipple and quick-connect fitting
- Thread Size
- 1 inch NPT, subject to confirmation against the original engine port
- Exterior Finish
- Milled
- Warranty
- 1-year manufacturer warranty as stated for this listing
What's in the Box
- 1 × outboard engine quick-connect flush kit, including the slide valve/male nipple and quick-connect fitting
Installation Notes
- Turn the engine off and allow it to cool before starting installation.
- Locate the engine's flushing port and remove the original threaded plug.
- Check that the kit's thread and sealing surface match the original plug and engine port.
- Screw the male nipple valve into the flushing port by hand. If necessary, use a wrench for a final slight tightening; do not overtighten or cross-thread the fitting.
- Attach the female quick-connect coupler to a standard garden hose.
- Snap the hose connector onto the installed nipple, turn on the water, and flush the engine according to the engine manufacturer's instructions.
- Monitor the connection for leaks during the first use and stop immediately if the fitting does not seal correctly.
Troubleshooting and FAQ
How do I confirm that this kit fits my engine?
Verify the thread size, sealing method and physical shape of your original flushing-port plug. This listing identifies the kit as using a 1-inch NPT thread, but port designs can vary by brand, model, year and engine configuration. Compare the original part and product specifications before ordering.
Can the male flush fitting remain installed on the engine?
Yes. When correctly matched and installed, the male nipple portion is intended to replace the original flush-port plug and remain installed, allowing the hose connector to be attached during future flushing.
What should I do if the connection leaks?
Turn off the water and check that the quick-connect is fully seated and that the male nipple is correctly threaded without cross-threading. Inspect the sealing surface and use only a sealant or sealing method approved for the engine and fitting. Do not force or overtighten the connection.
Is this a direct replacement for the OEM flush plug?
It is intended as an aftermarket replacement for the flush-port plug on compatible outboard engines. Compatibility must be confirmed by matching the engine port and thread specifications.
How often should I flush my outboard?
Follow the engine manufacturer's recommendations. Fresh-water flushing is commonly recommended after operation in salt water and may also be appropriate after use in silty or sandy fresh water to help reduce salt, sediment and debris buildup.
Is this an OEM part?
No. This listing is for an aftermarket replacement flush kit. The cross-reference numbers are provided to help identify possible applications and should not be treated as a guarantee of OEM manufacture or universal interchangeability.
What are the shipping options?
Standard shipping is offered at no additional charge where available. Typical transit is 5–15 days, while expedited options and exact delivery estimates are shown at checkout based on the destination.
What is the warranty and return policy?
This product is listed with a 1-year warranty against manufacturing defects under normal use. Returns are accepted according to the applicable store policy, generally for unused products in their original condition. Contact support for warranty or return instructions.
Safety and Important Information
- Confirm the engine's flushing-port thread, sealing method and physical dimensions before purchase.
- Do not operate the engine or flush it without an adequate water supply and compliance with the engine manufacturer's instructions.
- Stop use if the fitting leaks, is damaged or cannot be installed without force.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended when the port condition or thread specification is uncertain.
About Sea Sierra
- Marine Parts Selection — Practical replacement components for routine boating maintenance and repair.
- Global Fulfillment — Standard delivery is available to most regions, with estimated transit times shown at checkout.
- Product Support — Contact support with your engine brand, model, year and original fitting details when application assistance is needed.
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