Mercury – Quicksilver Through Gear Case Flushing Kit | Maintenance Accessory | Rubber, Stainless & Plastic | 44357Q2

Overview

Salt, silt, and debris can take a toll on your cooling system, but regular flushing keeps everything clean and running cool. The Mercury Marine 44357Q2 Quicksilver Through Gear Case Flushing Kit makes that easy. Designed for Mercury and Mariner outboards (20HP and up) and most MerCruiser sterndrives, this semi-universal kit connects directly to a standard garden hose for quick freshwater flushing. Built from durable rubber, stainless steel, and plastic, it resists corrosion and lasts for years of service — a simple, effective way to protect your engine from corrosion and marine buildup.

Key Features

• Purpose: Flushes salt, sand, and invasive species from cooling passages through the gearcase.
• Material: Made with marine-grade rubber, stainless steel, and plastic for strength and corrosion resistance.
• Design: Includes an integrated garden hose coupler for quick, secure attachment.
• Performance: Helps prevent internal corrosion and overheating caused by salt and debris buildup.
• Ease of Use: Installs in seconds — simply connect, flush, and disconnect.

Engine & Boat Compatibility

• Mercury and Mariner outboards 20HP and above.
• 2005 and newer Mercury FourStroke 8–15HP outboards and BigFoot 9.9–15HP.
• All MerCruiser sterndrives, except Bravo One Performance and BlackHawk models.
• 2000 and newer V6 outboards and Bravo drives with dual water pickups, use with Dual Flush Seal Kit 881150Q1.
• Suitable for both freshwater and saltwater boats.

Performance & Real-World Benefits

The 44357Q2 flushing kit makes maintenance quick and painless. After a day on the water, simply connect your garden hose, flush the system, and you’re done. The freshwater flow clears out salt, sediment, and plant matter that can build up in your engine’s cooling system — the same things that cause corrosion, poor cooling, or clogging over time.

It’s also a must-have for boats used in brackish or saltwater, helping extend engine life and prevent overheating. Regular flushing keeps your cooling passages clear and ready for the next outing.

Why Choose Mercury OEM

The Quicksilver 44357Q2 is a genuine Mercury Marine product, built with high-quality materials that withstand years of use. Cheaper imitation kits often use weaker fittings or low-grade rubber that crack or corrode quickly.

Mercury’s OEM design ensures a tight seal, reliable water flow, and long-lasting durability. It’s the same quality used by Mercury technicians and dealers — simple, proven, and built for real-world use.

FAQ

Q1: What engines does this flushing kit fit?
It fits Mercury and Mariner 20HP+ outboards, 8–15HP FourStroke (2005+), BigFoot 9.9–15HP, and MerCruiser sterndrives (except Bravo One Performance and BlackHawk).

Q2: What’s it made from?
A mix of rubber, stainless steel, and heavy-duty plastic for long life and corrosion resistance.

Q3: How do I use it?
Connect to a standard garden hose, attach to the gearcase intake, and run freshwater through — but never start the engine while attached.

Q4: Is this only for saltwater?
No. It’s perfect for fresh, salt, or brackish water, or when flushing out plant material after trailering.

Q5: Why OEM over aftermarket?
Mercury’s OEM kit provides a secure fit, proven materials, and reliability backed by factory testing.