Mercury – Drain Plug Gasket | FourStroke Series | Marine-Grade Seal Material | 8M0204692

Overview

Every boater knows there are a few small parts that carry more weight than you’d expect, and a drain plug gasket is one of them. When you’re relying on your outboard to get you home across a breezy bay or guide you through a narrow marsh channel, you want to know every seal is doing its job. You want to feel that quiet confidence — that sense that your engine is tight, protected, and ready for whatever the day brings. This genuine Mercury Marine part delivers exactly that kind of reassurance. It’s a simple piece, but it stands between your gearcase and the water that surrounds it, and that makes it essential.

Key Features

• Designed to seal the drain plug on select Mercury FourStroke outboards
• Engineered with marine-grade sealing material for long-lasting durability
• Maintains precise OEM dimensions for a correct, secure fit
• Mercury Marine part number 8M0204692
• Resists compression, swelling, and breakdown in harsh marine environments
• Provides a tight, leak-free seal during gear lube changes and routine service

Engine & Boat Compatibility

Fits a wide selection of Mercury FourStroke outboards, including:

• Seventy-five, eighty, ninety, one-hundred, and one-hundred-fifteen horsepower EFI FourStroke models
• Nine-point-nine to fifteen horsepower FourStroke platforms, including three-hundred-twenty-three cubic centimeter variants
• Twenty-five horsepower FourStroke models within the listed serial ranges
• Thirty, forty, fifty, and sixty horsepower carbureted and EFI FourStroke engines in both three-cylinder and four-cylinder configurations
• BigFoot and Bodensee variants within specified serial ranges
• Ideal for fishing boats, pontoons, small cruisers, tenders, jon boats, and multipurpose recreational rigs

Performance & Practical Benefits

A proper drain plug gasket might look small, but the peace of mind it brings is huge. When you remove and reinstall your gearcase plug during a lube change, this gasket is what keeps water out and lubrication in. With a worn or generic gasket, you might get a slow seep or, worse, water intrusion that leads to costly internal wear. With this OEM gasket in place, the seal feels tight, smooth, and steady — exactly what you want when you thread the plug back in.

You’ll feel the difference the moment you tighten it down. There’s a secure, confident stop that lets you know the gasket has compressed evenly and sealed correctly. It resists crushing or deforming, even in engines that see long hours or rough-water runs. In daily use, it helps maintain proper lubrication, protects the gearcase from moisture, and supports smoother performance season after season.

Why Buy OEM

Gaskets might seem like a place to save a few dollars, but using aftermarket substitutes often leads to uneven sealing, premature breakdown, or poor material quality. Marine environments are unforgiving — salt, heat, vibration, and pressure all work against the seal. A genuine Mercury Marine part is built to handle all of it.

This gasket uses the exact materials, thickness, and tolerances Mercury designed for their FourStroke gearcases. That means no guessing, no leaks, and no unexpected failures. It’s dependable, cost-effective, and designed to do the job right the first time. Any seasoned boater will tell you: a good seal is worth its weight in gold.

FAQ

Q1: Which Mercury engines does the Drain Plug Gasket 8M0204692 fit?

It fits a wide range of Mercury FourStroke outboards from nine-point-nine to one-hundred-fifteen horsepower within specific serial ranges.

Q2: What makes this gasket better than aftermarket alternatives?

OEM precision. It uses correct materials and dimensions to ensure a consistent, leak-free seal.

Q3: How do I know this is the correct replacement?

Check your outboard’s serial number and model specifications. If your engine falls within the listed FourStroke series, this is the correct part.

Q4: Can it be used in both saltwater and freshwater?

Yes — it’s designed to resist corrosion, swelling, and deterioration in all marine environments.

Q5: Is installation straightforward?

Absolutely. Replace it during each gear lube change, tighten the plug properly, and you’re ready to go.