Gearcase Drain Plug Gasket Washer – Fits Mercury Marine/Mercruiser Outboards & Sterndrives (Replaces 26-830749)
Gearcase Drain Plug Gasket Washer – Fits Mercury Marine/Mercruiser Outboards & Sterndrives (Replaces 26-830749) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gearcase Drain Plug Gasket Washer – Fits Mercury Marine/Mercruiser ...
Product Details
This Gearcase Drain Plug Gasket Washer provides a reliable seal for lower unit drain and fill screws on most Mercury Marine and Mercruiser outboards and sterndrives that use a 3/8-16 screw size. It is not intended for models of Japanese origin. The modern yellow, rubber-coated steel core design replaces the older blue fiber-style gaskets for superior durability and sealing.
This part directly replaces Mercury part numbers 26-830749 and 8M0204693, as well as aftermarket equivalents from Quicksilver, PEUTIER, RARAYC, and Isslly.
- Ensures a direct-fit installation with compatible gearcase drain/fill screws.
- Features a tear-resistant and corrosion-resistant construction for longevity.
- Provides excellent resistance to oil degradation, ensuring a tight seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 26-830749 | 8M0204693 |
| Quicksilver | 26-830749 | |
| PEUTIER | 26-830749 | |
| RARAYC | 26-830749 | |
| Isslly | 26-830749 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine & Mercruiser models, compatibility often depends on the sterndrive series or engine serial number. Please verify against the notes provided.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Various Alpha One (Gen.II) | - | - | 1996–1997 | 26-830749 | For serials 0F680000-0K999999 |
| Mercury | Bravo One/Two/Three/X/XR Series | - | - | All | 26-830749 | For serials 0W240000 & Up |
| Mercury | NXT1 Drive | - | - | All | 26-830749 | For serials 0M954569 & Up |
| Mercury | M8 Drive | - | - | All | 26-830749 | For serials 0M964870 & Up |
| Mercury | Vazer Drive | - | - | All | 26-830749 | For serials 0W995000 & Up |
| Mercury | 40-60 EFI | 40-60 | 4-Stroke | Multiple | 26-830749 | Multiple serial ranges |
| Mercury | 70-90 EFI | 70-90 | 4-Stroke | Multiple | 26-830749 | For serials 2B095049 & Up |
| Mercury | 75-115 DFI/EFI | 75-115 | Various | Multiple | 26-830749 | Multiple serial ranges |
| Mercury | 115-150 EFI | 115-150 | 4-Stroke | Multiple | 26-830749 | For serials 2B095049 & Up |
| Mercury | 135-200 Verado | 135-200 | 4-Stroke | Multiple | 26-830749 | 4 & 6 Cylinder models |
| Mercury | 175-300 Four Stroke | 175-300 | 4-Stroke | Various | 26-830749 | 3.4L V6 & 4.6L V8 models |
| Mercury | 200-300 Verado | 200-300 | 4-Stroke | Multiple | 26-830749 | 6 Cylinder models |
| Mercury | 250-300 4.6L V8 Racing | 250-300 | - | 2015 & Up | 26-830749 | Various configurations |
| Mercury | 450 4.6L V8 Racing | 450 | - | Various | 26-830749 | Sport Master & Torpedo models |
| Mercury | Zeus 3000 | - | - | Multiple | 26-830749 | Multiple serial ranges |
Technical Specs
- Product Type
- Gearcase Drain Plug Seal Washer
- Installation
- Direct fit with gearcase drain/fill screws
- Housing Material
- Stainless steel core with rubber coating
- Housing Color
- Yellow
- Dimensions
- OD: 14 mm (0.55 in), ID: 9 mm (0.35 in), Thickness: 1.5 mm (0.06 in)
- Fitting Type
- Flat washer
- Thread Size
- Compatible with 3/8-16 drain/fill screws
- Other Technical Attributes
- Tear-resistant gearcase drain screw seal; excellent oil resistance and corrosion resistance
- Warranty
- 1 year (RARAYC)
What’s in the Box
Package contents vary by the manufacturer selected. Please choose your preferred pack size.
- PEUTIER: 6 x Gearcase Drain Plug Seal Washer (26-830749)
- RARAYC: 6 x Gearcase Drain Plug Seal Washer (26-830749)
- Quicksilver OEM: 2 x Gearcase Drain Plug Seal Washer (26-830749)
- Isslly: 10 x Gearcase Drain Plug Seal Washer (26-830749)
Installation Notes
- Position a suitable drain pan under the lower unit of your sterndrive or outboard.
- Using a large flathead screwdriver, remove the lower drain/fill screw and the old gasket.
- Remove the upper vent screw and its gasket to allow oil to drain completely.
- Inspect the drained oil for any signs of metal shavings or water contamination, which may indicate other issues.
- Once fully drained, clean the screw threads and surrounding area.
- Place the new gasket onto the lower drain/fill screw and reinstall it. Tighten until snug, but do not overtighten.
- Fill the gearcase with the manufacturer-specified gear lube through the upper vent hole until fluid begins to flow out.
- Install the new gasket on the upper vent screw and tighten it securely. Clean any excess lube from the housing.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
This gasket fits most Mercury Marine and Mercruiser outboards and sterndrives with 3/8-16 drain/fill screw holes. To ensure a perfect match, please check your engine's serial number or drive model against the compatibility table provided on this page.
What is the difference between this yellow gasket and the older blue ones?
This yellow gasket is the current OEM-specified design, featuring a stainless steel core with a durable rubber coating. This construction offers a more reliable and reusable seal compared to the older, single-use blue fiber gaskets which are now obsolete.
How often should I replace my gearcase drain gaskets?
It is best practice to replace the drain and vent plug gaskets every time you change your gearcase oil. This is typically done annually at the end of the boating season or according to the service interval specified in your engine's owner manual.
What are the signs of a failing drain plug gasket?
The most common sign of a failed gasket is a visible gear oil leak around the drain or vent plugs. Any indication of a leak means the seal is compromised and should be replaced immediately to prevent water from entering the gearcase and causing catastrophic failure.
Can I re-use my old drain plug gasket?
No, these gaskets are designed for single-use only. While the rubber-coated steel is durable, re-using a compressed gasket risks an improper seal, which can lead to oil leaks and water intrusion. Always use a new gasket when servicing.
Is this a single gasket or a multi-pack?
The quantity of gaskets per package varies by the brand you select. We offer options from different manufacturers in packs of 2, 6, or 10. Please refer to the "What’s in the Box" section to see the contents of each option.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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