Pair of Gearbox Gear Oil Drain / Fill Plug Seals for Mercury Mariner Outboards

Premium-quality aftermarket gearbox gear oil drain and fill plug seal gaskets for selected Mercury and Mariner outboard engines.

Supplied as a pair of 2 seals, ideal for replacement when carrying out a gearbox / lower unit gear oil change.

Designed as replacement seals for selected Mercury and Mariner applications using:

26-8M0204693 / 26-830749

Package Contains

2 x Gear Oil Drain / Fill Plug Seal Gaskets

Fits Selected Mercury & Mariner Outboards

Suitable for selected Mercury and Mariner outboard gearcases requiring the corresponding gear oil drain / fill plug seals.

Mercury and Mariner have used different drain plug seals across different engine and gearbox generations, so please confirm compatibility using your:

Engine model
Engine serial number
Existing seal
Original Mercury / Mariner part number

Please do not order by engine horsepower or appearance alone.

Replaces Mercury / Mariner Part Numbers

26-8M0204693
8M0204693
26-830749
830749

OEM part numbers are used for identification and reference purposes only.

Product Features

Pair of 2 seals
Gear oil drain plug seal
Gear oil fill plug seal
Gearbox drain plug gasket
Gearbox fill plug gasket
Gearcase drain screw seal
Gearcase fill screw seal
Lower unit oil drain washer
For selected Mercury outboards
For selected Mariner outboards
Marine-grade quality aftermarket part
Manufactured to OEM specifications
Designed as a replacement for the corresponding OEM application
Helps provide a reliable seal around the gear oil plugs
Ideal for routine gearbox servicing
New
UK stock

Important – GEARBOX / GEAR OIL Seals

These seals are for the GEARBOX / LOWER UNIT gear oil drain and fill plugs.

They should not be confused with the engine oil sump / drain plug gasket used on a 4-stroke engine.

When carrying out a full service, the engine oil drain plug and gearbox gear oil drain/fill plugs may use completely different seals.

Recommended Replacement During Gear Oil Service

We recommend inspecting the drain and fill plug seals whenever carrying out a gearbox / lower unit oil change.

Previously used seals can become compressed, damaged or deteriorated.

Replacing the seals during routine servicing helps maintain a reliable seal around the gear oil drain/fill plugs and can help reduce the risk of:

Gear oil leakage
Water entering the lower unit
Contamination of the gearbox oil

Important – Please Check Compatibility

Mercury and Mariner have produced many different outboard and gearcase configurations, and different drain plug seals are used depending on the application.

Before purchasing, please check:

Engine is Mercury or Mariner
Exact engine model
Engine serial number
Existing drain/fill plug seal
Original Mercury / Mariner part number

For the safest identification, confirm that your application requires:

26-8M0204693 / 26-830749

If the seal looks the same as yours, this does not always mean it is the correct one for your outboard.

If you are unsure, please send us your engine model and serial number before purchasing and our technical team will be happy to check compatibility.

Why Buy From SSI Marine?

Marine-grade aftermarket & OEM-spec parts
Workshop-tested products
More than 10 years supplying outboard parts
UK stock
Same working day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
Technical support from experienced outboard specialists
Collection available from Leigh, Greater Manchester
Workshop open Monday–Friday, 9 AM–5 PM

Mercury Mariner Outboard Gearbox Gear Oil Drain Fill Plug Seal Gaskets x 2 26-8M0204693 26-830749