Mercury – Flushing Kit | Cooling System Maintenance Tool | Rubber, Stainless & Plastic | 44357T2

Overview

Keeping your cooling system clean is one of the easiest ways to extend your engine’s life. The Mercury Marine 44357T2 Flushing Kit lets you do just that — quickly and easily. Designed for Mercury and Mariner outboards (20HP and up) and most MerCruiser sterndrives, this simple kit connects to a standard garden hose so you can flush away salt, silt, and plant debris after every run. Built from durable rubber, stainless steel, and heavy-duty plastic, it’s made to handle years of use in harsh marine conditions.

Key Features

• Purpose: Flushes salt, sand, and debris from your cooling system to prevent corrosion.
• Design: Includes an integrated garden hose coupler for quick, easy freshwater connection.
• Material: Made from marine-grade rubber, stainless steel, and plastic for corrosion resistance.
• Performance: Helps maintain cooling efficiency and protects against galvanic corrosion.
• Ease of Use: Attaches in seconds — just connect, flush, and disconnect when done.
• Compatibility: For Mercury/Mariner outboards, FourStroke models, and MerCruiser sterndrives (details below).

Engine & Boat Compatibility

• Mercury and Mariner outboards, 20 horsepower and above
• 323cc 9.9/15HP BigFoot FourStroke
• 8–9.9HP FourStroke (2005 and newer)
• 351cc 15HP FourStroke
• MerCruiser sterndrives (excluding Bravo One Performance and BlackHawk)
• V6 outboards (2000 and newer) and Bravo drives with dual water pickups — use with Flush Seal Kit 881150K1

Performance & Real-World Benefits

The 44357T2 flushing kit gives you a quick way to keep your engine’s cooling system free from buildup after use. Hook it up to a garden hose, let freshwater run through, and it’ll wash out salt, sand, and anything else that can cause corrosion or clog the water passages.

Regular flushing is especially important in saltwater and invasive plant zones. It prevents rust, keeps your pump and passages clean, and extends the life of your cooling system. It’s simple maintenance that pays off in performance and peace of mind.

Why Choose Mercury OEM

The Mercury 44357T2 is a genuine factory tool, built with the same precision as your engine. Cheap aftermarket versions often use thin rubber or weak connectors that can leak or fail under pressure. Mercury’s OEM design ensures a tight fit, long-lasting materials, and smooth water flow every time.

It’s an easy, affordable way to keep your engine’s internals in top shape — and it’s made by the same people who built the motor it’s protecting.

FAQ

Q1: What engines does this kit fit?
It fits Mercury/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 durable combination of rubber, stainless steel, and plastic for strength and corrosion resistance.

Q3: How do I use it?
Connect it to your gearcase water inlets, attach a standard garden hose, and run freshwater through (engine off).

Q4: Is it only for saltwater?
No — it’s ideal for flushing out both salt and freshwater debris, and even plant material from infested areas.

Q5: Why OEM instead of aftermarket?
Mercury OEM kits last longer, fit securely, and ensure proper flow for complete system flushing.