Outboard Quick Connect Flush Kit for Mercury Verado & V10 Engines

In this review the Flush-M Outboard Quick Connect Flush Kit is evaluated for boat owners who need a reliable, long-lasting solution for engine flushing. The kit targets Mercury Verado, Pro XS, FourStroke and SeaPro outboards up to 500 HP and its single biggest strength is a rugged, UV-stable construction that replaces the OEM Mercury flush plug while adding a quick garden hose connection and a new cowling gasket seal for easier, cleaner flushing.

Key Features

• Patented fit: Designed specifically to replace the OEM Mercury flush plug #22 - 888958001, so installation matches factory specifications for compatible engines.
• UV-stable material: Glass filled nylon with UV stabilizers resists long-term degradation from sun exposure, extending service life on open boats.
• Durable internals: The internal spring is 316 stainless steel, which improves corrosion resistance in salt water environments.
• Quick connect convenience: Includes a black garden hose quick connect for fast attachment and hands-free flushing on the transom or under the cowling.
• Cowling gasket seal: A new gasket is included to restore a watertight cowling seal during and after flushing operations.
• Built-in check valve: Serviceable check valve prevents water egress if the OEM valve fails, reducing the need for immediate parts replacement.

Who It's For

The Flush-M kit is best for owners of Mercury Verado, Pro XS, FourStroke and SeaPro outboard engines from 75 to 500 HP, including V10 models, who want an OEM-replacement style flush port with a faster garden hose quick connect. It suits weekenders and professionals who spend time in salt water and need UV resistance and a corrosion-resistant spring.

Boaters who use non-Mercury outboards or those seeking a fully integrated shore-power flushing system should look elsewhere; this product is an aftermarket replacement focused on Mercury engine families and assumes basic familiarity with outboard cowling access and flush procedures.

Pros & Cons

Pros

• Solid, UV-stable 30% glass filled nylon body offers long-term durability in sunlight-exposed installations.
• 316 stainless steel internal spring improves longevity in salt water and reduces corrosion worries.
• Quick connect and included cowling gasket make flushing fast and reduce the risk of leaks while working.
• Serviceable built-in check valve provides a backup if the OEM valve fouls, maintaining functionality.

Cons

• Some users report inconsistent connection speed or sloppy feel with the quick connect, so fit can vary by hose and connector quality.
• Focused compatibility means it is not suitable for non-Mercury outboards or very small engines below the listed HP range.

Specifications

Brand	Flush-M
Material	30% glass filled nylon
Internal spring	316 stainless steel
Compatible engines	Mercury Verado, Pro XS, FourStroke, SeaPro (75 - 500 HP)
OEM replacement	Replaces Mercury plug #22 - 888958001
Includes	Cowling gasket seal and black garden hose quick connect
Feature	Serviceable built-in check valve

Our Verdict

The Flush-M Outboard Quick Connect Flush Kit is a practical, durable choice for Mercury outboard owners who want an OEM-style replacement with easier hose hookup and improved UV and corrosion resistance. It is good value for those who flush regularly in salt water, though buyers should be aware that quick connect feel varies and it is specific to Mercury engine families.

Frequently Asked Questions

Will this fit my Mercury V10 Verado?
Yes, the kit is compatible with Verado V10 models and covers Mercury engines from 75 to 500 HP.

Does the kit include a gasket?
Yes, a new cowling gasket seal is included to ensure a proper seal during installation and flushing.

Is the quick connect salt water safe?
The quick connect uses a 316 stainless steel spring and UV-stable nylon body to withstand salt water exposure, though connection feel may vary by hose type.