Drain Screw Gasket for Mercury MerCruiser and Johnson Evinrude Lower Unit 12-19183

Drain Screw Gasket – Fits Mercury MerCruiser & Johnson Evinrude Outboards

This rubber-coated stainless steel washer forms a tear-resistant seal for the 3/8-16 drain/fill screw holes in outboard and stern drive gearcases. It is designed for use on a wide range of Mercury, MerCruiser, Johnson, and Evinrude marine engines, providing a reliable, leak-free fit without requiring compression.

This part directly replaces Mercury 12-19183Q02, 12-19183K02, 12-191833, 191832, 19183, 19183B, 20260B, 20260, F8186, F50556, F8077; Johnson Evinrude 307552, 300434; Sierra 18-2244, 18-2945, 18-29451-9; GLM 31170; Mallory 9-60101, 9-60102; and SEI Marine 98-102-09.

• Tear-Resistant Seal: Creates a durable seal for 3/8-16 drain/fill screw holes.
• Durable Material: Made from high-quality, rubber-coated stainless steel.
• Modern Design: The newer yellow design seals effectively without needing to be crushed like older fiber gaskets.

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.

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Confirm your engine model/year in the table below.

Mercury/MerCruiser

Johnson/Evinrude

Chrysler/Force/US Marine

Technical Specifications

Package Contents

• 1 x Drain Screw Gasket (12-19183Q02)

Installation Guide

1. Locate the drain and fill screws on the lower unit gearcase. They are typically large, flathead screws.
2. Position a suitable drain pan under the lower screw (drain screw).
3. Remove the top screw (vent screw) first, then remove the bottom drain screw to allow the oil to drain completely.
4. Carefully remove the old gasket from each screw. Clean the screw threads and the sealing surface on the gearcase.
5. Slide the new gasket onto each screw.
6. Reinstall the bottom drain screw first and tighten until snug. Do not overtighten.
7. Fill the gearcase with the recommended lubricant through the bottom hole until it flows out of the top vent hole.
8. Reinstall the top vent screw and tighten securely. Wipe away any excess oil and inspect for leaks.

Troubleshooting & FAQ

Q: How do I know if this gasket will fit my engine?

A: This gasket is designed for most Mercury, MerCruiser, Johnson, and Evinrude models with 3/8-16 drain/fill screw holes. The best way to confirm fitment is to check your OEM part number against the cross-reference list provided on this page. Also, verify your engine model is listed in the compatibility tables.

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

A: The yellow gasket is a newer design made of a rubber-coated stainless steel that seals effectively without being crushed. The older style blue, orange, or black gaskets were a fiber design that required compression to create a seal and were typically single-use.

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

A: It is highly recommended to replace the drain and fill screw gaskets every time you change your gearcase oil. This ensures a proper, leak-free seal and protects your engine's lower unit from water intrusion.

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.