Volvo Penta IPS Active Corrosion Protection Anode – Fits Volvo Penta IPS Drive Systems (Replaces 21174476)
Volvo Penta IPS Active Corrosion Protection Anode – Fits Volvo Penta IPS Drive Systems (Replaces 21174476) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Volvo Penta IPS Active Corrosion Protection Anode – Fits Volvo Pent...
Product Details
This is a Volvo Penta IPS Active Corrosion Protection Anode, designed as a direct-fit replacement for twin, triple, and quadruple IPS drive configurations. It is compatible with a wide range of models including IPS-A through IPS-F, IPS15-A, IPS15-B, IPS2-A through IPS2-C, IPS20-D, IPS3-A, IPS3-C, and IPS30-D.
This part serves as a direct replacement and interchange for Volvo Penta 21174476, CMP/Martyr 40005206, Performance Metals VP-150, and is a component in the CMVPIPSKITA kit.
- Installs on the transom with bolt-on hardware.
- Constructed from a high-quality zinc alloy that meets MIL-SPEC standards for optimal performance in saltwater.
- Features two 10.5 mm mounting holes spaced 150 mm apart for a secure fit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 21174476 | OEM Reference |
| CMP/Martyr | 40005206 | Aftermarket Equivalent |
| Performance Metals | VP-150 | Aftermarket Equivalent |
| CMP/Martyr | CMVPIPSKITA | Kit Component |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | IPS-A | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS-B | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS-C | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS-D | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS-E | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS-F | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS15-A | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS15-B | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS2-A | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS2-B | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS2-C | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS20-D | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS3-A | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS3-C | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
| Volvo Penta | IPS30-D | 4-Stroke | 21174476 | For ACP systems on twin, triple and quadruple drives |
Technical Specs
- Product Type
- Active Corrosion Protection (ACP) Zinc Anode
- Installation
- Transom mount with bolt-on hardware
- Connection
- Two mounting holes, bolt-on
- Housing Material
- Zinc alloy meeting MIL-SPEC standards
- Dimensions
- Length: 350 mm (14"), Width: 84 mm (3.375"), Mounting Hole Diameter: 10.5 mm (0.41"), Hole Spacing: 150 mm (5.9") center-to-center
- Weight
- 6.12 kg (13.5 lb)
- Fitting Type
- Bolt-on
- Thread Size
- Mounting holes: 10.5 mm (0.41")
- Other Technical Attributes
- Meets MIL-SPEC A-18001K, MIL-SPEC A-18001A, and MIL-SPEC A-18001 standards
What’s in the Box
- 1 x Active Corrosion Protection Zinc Anode Plate (21174476)
Installation Notes
- Ensure the vessel's ignition and all related electrical systems are turned off before beginning installation.
- Locate the existing ACP anode on the transom. It is a large, rectangular plate.
- Carefully unbolt and remove the old, corroded anode. Retain the mounting hardware if it is in good condition, as new hardware may not be included.
- Thoroughly clean the mounting surface on the transom to ensure a good electrical connection. Remove any marine growth, old sealant, or corrosion.
- Position the new anode plate over the mounting holes.
- Apply a marine-grade thread locker to the bolts and tighten them securely and evenly. Do not overtighten.
- After installation, verify the anode is firmly attached to the transom with no gaps.
Troubleshooting & FAQ
How do I know if this anode is correct for my Volvo Penta IPS drive?
This anode is designed for specific Volvo Penta IPS models with Active Corrosion Protection (ACP) systems. Please review the compatible models listed in the "Engine & Model Compatibility" table. Cross-reference your drive system's model number and the OEM part number (21174476) to ensure a perfect match.
What are the signs that my ACP anode needs to be replaced?
You should inspect the anode regularly. Replacement is necessary when the anode is approximately 50% consumed. Signs of wear include significant pitting, crumbling, or large sections missing. A heavily corroded anode cannot effectively protect your drive system.
How often should I replace this transom anode?
Replacement intervals depend heavily on your boat's usage, water conditions (salinity and temperature), and whether you have any stray electrical currents. A common practice is to inspect anodes at least every 6 months and replace them annually or whenever they show 50% erosion.
Is mounting hardware included?
This listing is for the anode plate only. Sources differ on whether the OEM part includes hardware, so it is best to assume it is not included. You may need to reuse your existing bolts or source them separately.
Can this zinc anode be used in freshwater or brackish water?
Zinc anodes are specifically formulated for optimal protection in saltwater. For freshwater, an aluminum alloy anode is recommended. For brackish water, an aluminum or magnesium anode may be more suitable depending on the specific water composition.
What is the difference between OEM and aftermarket parts?
This listing is for an aftermarket replacement, not an OEM part. It has been engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function, using comparable high-quality materials. Our parts are produced in an ISO 9002 certified facility and are batch-inspected to ensure quality and performance.
How much is shipping and how fast will I get my order?
We ship worldwide quickly—typical transit time is 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original packaging. Please see our full policy page or contact us 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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