Sea-Dog Lower Unit Gear Oil Pump for Quart Bottles with 8mm Adapter

Sea-Dog Lower Unit Gear Oil Pump for Quart Bottles with 8mm Adapter

Make changing your boat's lower unit gear oil easier and cleaner with the Sea-Dog Lower Unit Gear Oil Pump. Designed to fit standard plastic quart bottles, this marine gear lube pump helps transfer gear oil directly into outboard and sterndrive lower units while reducing spills and mess during routine maintenance.

Featuring a flexible fill hose, metal threaded fitting, and included 8mm adapter, the Sea-Dog gear oil pump provides convenient access to hard-to-reach gearcase fill openings and is compatible with select Mercury, MerCruiser, Yamaha, Honda, Johnson, Evinrude, and other marine engines.

Whether you're performing seasonal boat maintenance or a routine lower unit gear oil change, this pump makes refilling your marine gearcase easier and more convenient.

Compatible Engine Applications

The standard metal threaded fitting is designed for compatible lower units from:

• MerCruiser
• OMC
• Evinrude
• Johnson
• Honda (select 70–90 HP models)
• Volvo
• Force
• Mercury (U.S.-origin models)
• Gamefisher

Included 8mm Adapter Compatibility

The included 8mm threaded adapter expands compatibility with select lower units from:

• Yamaha Outboard Motors
• Mercury (Japanese-origin models)
• Nissan
• Tohatsu
• Honda (select models)

Important: Lower unit fill plug thread sizes may vary by engine model, horsepower, and production year. Always verify your gearcase fitting requirements before purchasing.

Key Features & Benefits

• Fits Standard Quart Bottles: Designed for standard plastic quart-size marine gear oil containers.
• Cleaner Gear Oil Changes: Helps reduce spills and mess when refilling outboard and sterndrive lower units.
• Flexible Fill Hose: Provides easier access to difficult-to-reach lower unit fill plugs.
• Metal Threaded Fitting: Connects to compatible marine gearcase fill openings.
• Included 8mm Adapter: Expands compatibility with select Yamaha, Mercury, Nissan, Tohatsu, and Honda outboards.
• Convenient Marine Maintenance Tool: Ideal for routine lower unit gear oil changes and gearcase lubrication service.
• Multiple Engine Applications: Designed for use with a variety of compatible outboard and sterndrive lower units.

Product Specifications

• Brand: Sea-Dog
• Product Name: Lower Unit Gear Oil Pump
• Product Type: Marine Gear Lube Transfer Pump
• Bottle Compatibility: Standard Plastic Quart Bottles
• Primary Application: Outboard and Sterndrive Lower Unit Gear Oil Changes
• Hose Type: Flexible Fill Hose
• Fitting Type: Metal Threaded Gearcase Fitting
• Included Adapter: 8mm Threaded Adapter
• Compatible Brands: Select Mercury, MerCruiser, Yamaha, Honda, Johnson, Evinrude, OMC, Volvo, Nissan, Tohatsu, Force, and Gamefisher models

Easy Lower Unit Gear Oil Changes

Changing lower unit gear oil is an important part of routine outboard and sterndrive maintenance. The Sea-Dog Lower Unit Gear Oil Pump helps simplify this process by transferring lubricant from a standard quart bottle directly into the gearcase.

The flexible hose allows you to reach difficult fill locations, while the threaded fitting helps provide a secure connection to compatible lower unit openings.

For engines requiring an 8mm connection, the included adapter provides additional compatibility without requiring a separate fitting.

How to Use the Sea-Dog Lower Unit Gear Oil Pump

1. Attach the pump to a compatible plastic quart bottle of marine gear lubricant.
2. Select the appropriate threaded fitting or included 8mm adapter for your engine.
3. Connect the hose fitting to the lower gearcase fill opening.
4. Pump lubricant into the lower unit according to your engine manufacturer's recommended procedure.
5. Follow the manufacturer's instructions for filling, reinstalling plugs, and checking seals.

Always use the marine gear lubricant specified by your engine manufacturer.

Frequently Asked Questions

What is the Sea-Dog Lower Unit Gear Oil Pump used for?

The Sea-Dog gear oil pump transfers marine gear lubricant from a quart bottle into compatible outboard and sterndrive lower units during routine gear oil changes.

Does this pump fit standard quart bottles?

Yes. The pump is designed to fit standard plastic quart-size marine gear oil bottles.

Does the Sea-Dog gear oil pump include an 8mm adapter?

Yes. An 8mm threaded adapter is included for compatible Yamaha, Mercury, Nissan, Tohatsu, and Honda outboard lower units.

Will this pump work with Mercury and MerCruiser engines?

The standard metal fitting is designed for compatible MerCruiser and U.S.-origin Mercury lower units. The included 8mm adapter supports select Japanese-origin Mercury models. Always verify your engine's fitting requirements.

Does the pump include marine gear oil?

No. This listing is for the Sea-Dog gear oil pump and fittings. Marine gear lubricant is sold separately.