Magnesium Anode Kit – Fits Volvo Penta 290 Series
Magnesium Anode Kit – Fits Volvo Penta 290 Series is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Magnesium Anode Kit – Fits Volvo Penta 290 Series
Product Details
This Magnesium Anode Kit – Fits Volvo Penta 290 Series provides superior corrosion protection for Volvo Penta 290 series sterndrives operating in freshwater environments. The kit includes a collar anode that fits between the propeller and gear housing, plus a block anode for the gimbal housing with mounting hardware.
It serves as a direct replacement for Martyr CM290KITM, Seachoice 50-95351, Tecnoseal 290-MG-C, and BoatZincs 290-Kit-MG.
- Application: Freshwater Only
- Installation: External Mount
- Complete Kit: Includes collar anode, block anode, and all necessary mounting hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 875815 |
| Volvo Penta | 852835 |
| Martyr | CM290KITM |
| Seachoice | 50-95351 |
| Tecnoseal | 290-MG-C |
| BoatZincs | 290-Kit-MG |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta owners, this kit is designed for the 290 series and SP-E sterndrives. Please verify your specific model and part numbers.
| Brand | Model | Type | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | 290 | Sterndrive | 875815, 852835 | Both collar and block anodes included |
| Volvo Penta | SP-E | Sterndrive | 875815, 852835 | Compatible per BoatZincs |
Technical Specs
- Product Type
- Sacrificial Anode Kit
- Installation
- External Mount
- Material
- Magnesium
- Application
- Freshwater Only
- Components
- Collar Anode, Block Anode, Mounting Hardware
- Weight
- 0.63 kg (1.38 lb)
- Dimensions
- 33.0 cm L x 22.5 cm W x 5.0 cm H
- Boat Type
- Motor Boat, Sterndrive
- Environmental
- Cadmium-Free
- Standards
- Meets Mil-Spec A-21412(SH) (Seachoice)
- Other Technical Attributes
- Most active metal on the Galvanic scale, provides superior protection in freshwater environments
What’s in the Box
- 1 x Collar Anode (CMV18 / 876137)
- 1 x Block Anode for Gimbal Housing (CM852835 / 873178)
- 18 x Stainless Steel Screws (8/304)
Installation Notes
- Haul the boat out of the water and ensure the sterndrive is clean and dry.
- Locate and remove the old, depleted anodes from the gimbal housing and propeller shaft area.
- Thoroughly clean the mounting surfaces on the sterndrive, ensuring a good metal-to-metal contact. Do not paint the anode or the surface beneath it.
- Install the new block anode onto the gimbal housing using the provided screws.
- Install the new collar anode between the propeller and the gear housing.
- Tighten all hardware to the manufacturer's recommended torque specifications. Ensure the anodes are securely fastened.
Troubleshooting & FAQ
Why use a magnesium anode instead of zinc or aluminum?
Magnesium is the most active metal on the galvanic scale, providing the most effective protection against corrosion in freshwater. Zinc anodes are designed for saltwater, and aluminum anodes are best for brackish or salt water.
How often should I inspect or replace these anodes?
Inspect your anodes at least annually or every time you haul your boat. They should be replaced when they are 50% corroded to ensure your sterndrive components remain protected.
What are the signs that my anodes are not working correctly?
If your anodes show no signs of corrosion (pitting, "chalky" appearance) after a season in the water, they may not be making good electrical contact. If you see signs of corrosion on your sterndrive itself, the anodes are not functioning correctly and should be inspected immediately.
Will this kit fit sterndrives other than the Volvo Penta 290 series?
This kit is specifically designed for the Volvo Penta 290 and SP-E series. We cannot guarantee fitment or proper protection on other models. Always verify part numbers before ordering.
Do I need to paint the new anodes or the area underneath?
No. Never paint an anode or the surface it mounts to. Paint will act as an insulator and prevent the anode from providing galvanic protection.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. The manufacturer operates an ISO 9002 facility and batch-inspects parts for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations; expedited options appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and 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.
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