MasterGuard Hub Kit 25 – 20 Series | 9.9–35hp Outboards (3" Gearcase)
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MasterGuard® Installation Kit 25 — 20 Series, 3" Gearcase
The MasterGuard hub kit is the foundation of the interchangeable hub propeller system — a one-time purchase that stays on your engine while you swap propeller housings as needed. Kit 25 is engineered for outboard engines from 9.9 to 35hp with 3-inch gearcases, and is compatible with Hustler and Express Mach3 propeller housings in this size range.
Best Use Case
This kit is the right choice for boaters running small-to-mid outboards (9.9–35hp, 3" gearcase) who want the flexibility to change propeller pitch or replace a damaged prop housing without buying a complete new propeller assembly. It’s especially practical for fishing boats, jon boats, and small aluminum hulls where prop strikes on rocks, sandbars, or shallow-water debris are a real possibility — the hub absorbs the impact and can often be reused, protecting your lower unit and saving the cost of a full propeller replacement.
Key Features
- Lifetime Warranty — The only hub kit in the world backed by a lifetime warranty, with no restrictions except extreme commercial use. Warranted even if the propeller housing is destroyed (consumer use).
- One-Piece Patented Design — Marine bronze splines over-molded with glass-filled nylon in a single piece — eliminates the failures common in multi-part sleeve-and-spline or pressed-in rubber hub systems.
- Reusable After a Prop Strike — The hub absorbs impact energy to protect your lower unit. In most cases it can be reused after a strike; if not, it’s covered under warranty.
- Shock & Vibration Absorption — High-tech polymer cushion reduces shift shock and harmful vibrations that can damage the engine and drive.
- Corrosion-Resistant Bronze Splines — Premium marine bronze construction stands up to saltwater and freshwater environments.
- Small Diameter Design — Allows for greater exhaust flow and improved horsepower output.
- OEM Compatible — Adapts to the factory thrust washer and prop nut. No special tools required.
Specifications
- Part Number: 11200500 (Kit 25)
- Series: 20
- Gearcase: 3"
- Compatible Engine Range: 9.9–35hp outboards
- Compatible Brands: Coleman, Evinrude, Honda, Johnson, Mariner, Mercury, Nissan, Parsun, Suzuki, Tohatsu, Yamaha
- Compatible Propellers: Hustler and Express Mach3 propeller housings for 3" gearcase
- Includes: Hub assembly, prop nut spacer, installation instructions
Parts Desk Insights
Hub kit only — propeller housing sold separately. This kit is the hub component of the interchangeable system. You will also need to purchase the correct Hustler or Express Mach3 propeller housing for your desired pitch. Confirm your engine make, model, and year against the application chart to verify compatibility before ordering.
Save up to 33% on future prop replacements. Once this hub is installed, you only need to replace the propeller housing if it’s damaged — not the entire assembly. Browse other 20 Series kits and related MasterGuard options:
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.