Propeller Safety Guard – Fits Mercury/Mariner, Yamaha, Johnson/Evinrude, Honda, Suzuki, Tohatsu/Nissan 9.9-20 HP (Replaces GHmarine PG0090, NorthBoat 9" Propeller Safety Guard)
Propeller Safety Guard – Fits Mercury/Mariner, Yamaha, Johnson/Evinrude, Honda, Suzuki, Tohatsu/Nissan 9.9-20 HP (Replaces GHmarine PG0090, NorthBoat 9" Propeller Safety Guard) 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
Propeller Safety Guard – Fits Mercury/Mariner, Yamaha, Johnson/Evin...
Product Details
This universal Propeller Safety Guard is designed for most 9.9 HP to 20 HP outboard motors. It provides protection for swimmers and marine life from propeller strikes, and shields the propeller from damage in shallow or debris-filled waters.
It serves as a direct replacement for GHmarine part number PG0090 and the NorthBoat 9" Propeller Safety Guard.
- Installs securely by bolting to the outboard's cavitation plate and skeg.
- Made from durable, high-visibility polypropylene for harsh marine environments.
- Includes stainless steel mounting hardware and a drill bit for straightforward installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| GHmarine | PG0090 |
| NorthBoat | 9" Propeller Safety Guard |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Notes |
|---|---|---|---|---|
| Mercury / Mariner | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
| Yamaha | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
| Johnson / Evinrude | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
| Honda | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
| Suzuki | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
| Tohatsu / Nissan | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Except Big Foot & High Thrust models (require 11" guard) |
Technical Specs
- Product Type
- Outboard Propeller Guard / Safety Guard
- Installation
- Bolts to cavitation plate and skeg
- Connection
- Mounting hardware included (stainless steel bolts)
- Housing Material
- Rigid polypropylene plastic
- Housing Color
- Safety Yellow
- Dimensions
- 22.86 × 25.4 × 25.4 cm (9 × 10 × 10 inches)
- Weight
- 1.58 kg (3.3 lbs)
- Fitting Type
- Direct mount to outboard lower unit
- Propeller Fitment
- Fits propellers up to 8.5" in diameter
What’s in the Box
- 1 x Propeller Safety Guard (9" Yellow)
- 1 x 8.5 mm Drill Bit
- 8 sets x Installing Bolts (Stainless Steel)
Installation Notes
- Ensure the engine is off and the battery is disconnected for safety.
- Carefully position the propeller guard onto the lower unit's cavitation plate and skeg, ensuring it is centered.
- Mark the drilling locations on the cavitation plate through the guard's mounting holes.
- Using the provided 8.5 mm drill bit, carefully drill the marked holes.
- Align the guard with the new holes and fasten it using the supplied stainless steel bolts and nuts.
- Tighten all hardware securely. Do not overtighten, as this can damage the guard or cavitation plate.
- Manually rotate the propeller to confirm it has ample clearance and does not touch the guard at any point.
Troubleshooting & FAQ
Will this guard fit my Mercury 15 HP "Big Foot" motor?
No. This 9-inch guard is not compatible with "Big Foot" or "High Thrust" models, as they require a larger 11-inch guard for proper clearance.
What is the largest propeller this guard can fit?
This guard is designed to fit propellers up to 8.5 inches in diameter.
Is drilling required for installation?
Yes, installation requires drilling holes into the cavitation plate of your outboard's lower unit. A drill bit and all necessary mounting hardware are included in the package.
Can this guard improve my boat's performance?
Propeller guards are primarily safety devices and may slightly decrease top speed and performance due to increased drag. However, they can improve handling and thrust in some specific situations by channeling water flow.
What is the guard made of?
The guard is constructed from a single piece of molded, rigid polypropylene plastic, which is durable, corrosion-resistant, and colored safety yellow for high visibility in the water.
How do I know if the guard is installed correctly?
A correct installation is secure with no movement, and there is adequate clearance between the propeller blades and the inside of the guard cage. Always rotate the prop by hand after installation to check for any contact.
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.
Payment & Security
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