Star Brite 28401 Lower Unit Gear Lube Adapter Fitting – Nissan, Yamaha, Tohatsu & Honda
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Star Brite 28401 Lower Unit Gear Lube Adapter Fitting
Designed specifically for Nissan, Yamaha, Tohatsu, and Honda outboards, the Star Brite 28401 adapter fitting makes lower unit gear lube changes cleaner and easier. It attaches to standard 8 fl. oz. and 10 fl. oz. gear lube squeeze tubes and adds a flexible hose that reaches recessed or hard-to-access fill plugs without spills or awkward positioning.
This is the metric-thread variant — purpose-built for Japanese-brand outboards that use a different thread pitch than MerCruiser, OMC, and other American-market engines.
What's Included
- Metal threaded adapter fitting (metric thread)
- Flexible extension hose for reaching recessed fill ports
Compatible Engines
- Nissan outboards
- Yamaha outboards
- Tohatsu outboards
- Honda outboards (smaller displacement models — see owner's manual for thread confirmation)
Always verify the correct thread size in your engine's owner's manual before use. For MerCruiser, OMC, Evinrude, Johnson, Volvo, Force, Mercury (US-origin), and Gamefisher lower units, see the Star Brite 28402 Adapter Fitting instead.
Best Use Case
This fitting is the right choice for owners of Yamaha, Nissan, Tohatsu, or smaller Honda outboards who perform their own lower unit maintenance using squeeze-tube gear lube. It's especially valuable when the fill plug is recessed or surrounded by tight engine cowling, making a straight-tube application messy or impractical. For higher-volume applications or full pump-style service, see the Star Brite Lower Unit Quart Pump.
Parts Desk Insights
This is the metric-thread counterpart to the Star Brite 28402 — stock both and recommend based on engine brand. The 28401 is the correct call for Yamaha and Tohatsu owners, which represent a large share of the recreational outboard market. Thread mismatch is the most common customer error with these fittings; always prompt customers to confirm thread pitch in their owner's manual. Strong add-on sell alongside any gear lube squeeze tube purchase for Japanese-brand outboard customers.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.