Aluminum Trim Tab Anode – Fits Mercury/Mariner Outboards 35HP+ & MerCruiser Alpha One (Replaces 822777A1, 46399A1)
Aluminum Trim Tab Anode – Fits Mercury/Mariner Outboards 35HP+ & MerCruiser Alpha One (Replaces 822777A1, 46399A1) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Aluminum Trim Tab Anode – Fits Mercury/Mariner Outboards 35HP+ &...
Product Details
This high-quality Aluminum Trim Tab Anode is engineered for a broad range of Mercury/Mariner outboards (35HP and above, 1994–present), MerCruiser Alpha One stern drives (1985–1990), and select Force outboards (90/120HP, 1995+). It serves as a crucial sacrificial component, protecting your engine's lower unit from galvanic corrosion in both fresh and salt water.
It directly replaces OEM and aftermarket part numbers including Sierra 18-6014A, Mercury 822777A1, Mercury 46399A1, Mercury 822777Q1, GLM 12680, and Tecnoseal 00804AL.
- Easy bolt-on installation with a single center bolt.
- Designed for optimal protection in fresh, brackish, and salt water.
- Provides enhanced propeller clearance for high-rake propeller applications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Sierra | 18-6014A |
| Mercury | 822777A1 |
| Mercury | 46399A1 |
| Mercury | 822777Q1 |
| GLM | 12680 |
| Tecnoseal | 00804AL |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury, Mariner, and Force Outboards:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 225 (3.0L Carb) | 225 | 2-Stroke | 1994–1998 | 822777A1/822777Q1 | S/N 0D280813 thru 0G760299 |
| Mercury | 225 (3.0L Carb) | 225 | 2-Stroke | 1999–2001 | 822777A1/822777Q1 | S/N 0G760300 thru 0T408999 |
| Mercury | 225 Marathon (3.0L Carb) | 225 | 2-Stroke | 1994–1995 | 822777A1/822777Q1 | S/N 0G245605 thru 0G760299 |
| Mercury | 225 SeaPro (3.0L Carb) | 225 | 2-Stroke | 1994–1998 | 822777A1/822777Q1 | S/N 0G245605 thru 0G760299 |
| Mercury | Most outboard models | 35+ | 2-Stroke & 4-Stroke | 1995-Present | 46399A1/46399A2 | For models requiring high-rake propeller clearance |
| Force | 90/120 | 90/120 | 2-Stroke | 1995 and up | 46399A1 |
For MerCruiser Stern Drives:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Alpha One SS | Various | 4-Stroke | 1986–1989 | 46399A1 | |
| MerCruiser | SSM II/III/IV/V | Various | 4-Stroke | 1985–1990 | 46399A1 | |
| MerCruiser | All stern drive models | Various | 4-Stroke | 1985-Present | 46399A1/822777A1 | For applications requiring high-rake propeller clearance |
Technical Specs
- Product Type
- Aluminum Trim Tab Anode
- Installation
- Bolt-on
- Material
- Aluminum Alloy
- Application
- Fresh water and salt water
- Connection
- Single bolt mount, 7/16"-14 thread
- Dimensions
- 3-1/2" diameter × 3-1/2" height (89 mm × 89 mm)
- Weight
- 1.0 lb (0.45 kg)
- Thread Size
- 7/16"-14
- Warranty
- Manufacturer standard warranty
- Other Technical Attributes
- Provides longer-lasting protection than zinc anodes in brackish or fresh water
What’s in the Box
- 1 x Aluminum Trim Tab Anode (822777A1/46399A1)
- 1 x Mounting Bolt
Installation Notes
- Ensure the engine is off and the battery is disconnected for safety.
- Locate and unbolt the old trim tab anode from the underside of the anti-ventilation plate.
- Thoroughly clean the mounting surface on the gearcase, ensuring a clean, bare metal contact point for electrical continuity.
- Position the new anode and fasten it securely with the provided mounting bolt. Do not over-tighten.
- Ensure the new anode does not interfere with the propeller's movement. Adjust if necessary.
- Once installation is confirmed correct, reconnect the battery.
Troubleshooting & FAQ
Is this aluminum anode better than a zinc one?
Aluminum anodes provide superior protection in fresh and brackish water environments compared to traditional zinc anodes. They are also effective in salt water, making them an excellent all-around choice.
How do I know when to replace my trim tab anode?
Inspect your anodes at least every six months. You should replace them when they are approximately 50% consumed or show signs of severe pitting, crumbling, or have fallen off. Regular replacement is critical for engine protection.
Can I install this part myself?
Yes, this is a straightforward DIY task for most boat owners. It only requires basic hand tools to unbolt the old anode and install the new one. However, always follow safety precautions, such as disconnecting the battery.
Why is a clean mounting surface so important?
The anode must make direct metal-to-metal contact with the gearcase to work correctly. Paint, corrosion, or marine growth on the mounting surface can insulate the anode, rendering it ineffective and putting your engine at risk.
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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