Drain Screw Gasket - Fits Mercury/Mercruiser Outboards & Sterndrives

Drain Screw Gasket - Fits Mercury/Mercruiser Outboards & Sterndrives (Replaces 26-830749, 26-8M0204693)

This drain screw gasket is designed for a wide range of Mercury/Mercruiser engines. It is compatible with outboard engines from 40 to 600 HP (2-Stroke & 4-Stroke, 1990–Present) and all models of sterndrive and inboard engines from 1994 to the present.

This part is a direct replacement for Mercury OEM part numbers 26-830749 and 26-8M0204693.

• Made from a durable, tear-resistant rubber-coated stainless steel washer.
• Designed for use with 3/8"-16 drain/fill screws.
• Ensures a proper seal to prevent gearcase lubricant leaks.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Mercury/Mercruiser Outboard Engines

Mercury/Mercruiser Sterndrive & Inboard Engines

Technical Specifications

Package Contents

• 1 x Drain Screw Gasket (Replaces 26-8M0204693)

Explosion Diagram

Installation Guide

1. Position a drain pan under the gearcase drain screw.
2. Using a large flathead screwdriver, carefully loosen and remove the lower drain/fill screw.
3. Inspect the old gasket on the magnetic tip of the screw for wear or damage and discard it.
4. Clean the screw and the gearcase sealing surface, ensuring they are free of old gasket material or debris.
5. Slide the new yellow gasket onto the drain screw.
6. Reinstall the screw with the new gasket and tighten it until it is snug. Do not overtighten.
7. Proceed with gear lube filling from the bottom hole as per your engine's service manual.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my specific Mercury engine?

A: This gasket fits most Mercury/Mercruiser outboards (40-600 HP, 1990-Present) and sterndrives (1994-Present). To be certain, please check the compatible engine model tables on this page or cross-reference your existing part number with 26-830749 or 26-8M0204693.

Q: What is the difference between this yellow gasket and older black ones?

A: This yellow, rubber-coated stainless steel washer (26-8M0204693) directly replaces the older part number 26-830749. It is designed to be more tear-resistant and provide a superior seal for your gearcase.

Q: How often should I replace my drain screw gasket?

A: It is best practice to replace the drain screw gaskets every time you change your gearcase lube, which is typically done annually or every 100 hours of operation, whichever comes first.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.