Sea Mule Flushmaster Flush Port Quick Connect for Yamaha Outboards 150-425 HP

The Sea Mule Flushmaster Flush Port Quick Connect is a permanent upgrade for Yamaha outboard engines that replaces the factory flush port plug with a true quick-connect fitting. Instead of fumbling with the OEM plug every time you flush the engine after a run, this fitting lets you snap a hose on and off in seconds, making routine freshwater flushing faster and easier.

The quick connect is built from marine grade materials engineered to resist UV exposure and the corrosive effects of saltwater and marine environments, so it holds up to repeated outdoor use. A double O-ring design seals the connection tightly to prevent leaks during flushing, and a secured locking cap keeps the port protected from accidental disconnection or debris intrusion during normal engine operation.

This fitting is compatible with Yamaha four-stroke outboard engines from 150HP to 425HP that are equipped with a flush port, and it can be installed on either the front or back of the engine depending on your setup. It is not compatible with 2024/2025 model-year 115HP or smaller Yamaha outboards, nor with Yamaha 50-115HP or 450HP outboards. The kit includes the male quick connect fitting along with two female hose quick connect fittings so you can attach your flushing hose directly.

Specifications

• Brand: Sea Mule
• Manufacturer Part Number: SM-FMQCY
• Compatible Engines: Yamaha four-stroke outboards, 150HP - 425HP, with a flush port
• Not Compatible With: 2024/2025 115HP or smaller Yamaha outboards; Yamaha 50-115HP/450HP outboards
• Material: Marine grade materials, UV and corrosion resistant
• Seal Design: Double O-ring
• Locking Cap: Secured locking cap
• Installation Location: Front or back of engine
• Includes: Mercury male quick connect fitting, 2 female hose quick connect fittings
• Weight: 0.5 pounds
• UPC: 860011567905

Fitment

• Yamaha four-stroke outboard engines, 150HP - 425HP, equipped with a flush port
• Not compatible with 2024/2025 115HP or smaller Yamaha outboards
• Not compatible with Yamaha 50-115HP/450HP outboards

Frequently Asked Questions

What engines does this quick connect fit? The Sea Mule Flushmaster Flush Port Quick Connect (SM-FMQCY) is compatible with Yamaha four-stroke outboard engines from 150HP to 425HP that are equipped with a flush port.

Will this work on a 2024 or 2025 Yamaha 115HP outboard? No. SM-FMQCY is not compatible with 2024/2025 model-year 115HP or smaller Yamaha outboards.

Does this fit Yamaha 50-115HP or 450HP outboards? No, this quick connect is not compatible with Yamaha 50-115HP or 450HP outboard engines.

What is included in the box? The SM-FMQCY kit includes a Mercury male quick connect fitting and two female hose quick connect fittings.

Can this be installed on the front or back of the engine? Yes, the Sea Mule Flushmaster quick connect can be installed on either the front or the back of the engine.

What material is the quick connect made from? It is constructed from marine grade materials designed to resist UV exposure and the corrosive effects of marine environments.

How does the seal stay leak free? A double O-ring design on the SM-FMQCY quick connect creates a tight seal to prevent leaks each time the engine is flushed.

What is the purpose of the locking cap? The secured locking cap protects the flush port fitting from accidental disconnection during normal engine operation.

Does this replace the factory Yamaha flush port plug? Yes, the Sea Mule Flushmaster quick connect is designed to permanently replace the existing OEM flush port plug on compatible Yamaha outboards.

How much does this quick connect weigh? The Sea Mule Flushmaster Flush Port Quick Connect for Yamaha outboards weighs 0.5 pounds.

Is this the same fitting used on other outboard brands? SM-FMQCY is the Yamaha-specific version of the Flushmaster quick connect; other outboard brands use a separate, differently numbered fitting.

How do I use the quick connect once it is installed? Twist off the cap, connect your flushing hose to the quick connect, run the flush, then reverse the steps to disconnect and recap the SM-FMQCY fitting.