Martyr CMBRAVO1KITM Magnesium Anode Kit – MerCruiser Bravo I | Freshwater
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Martyr Magnesium Anode Kit for MerCruiser Bravo I — Freshwater
A complete set of sacrificial anodes for the MerCruiser Bravo I sterndrive, formulated in magnesium alloy for freshwater use. This kit covers all primary corrosion exposure points on the Bravo I drive — trim tab, bearing carrier, driveshaft housing, and trim rams — so you can complete a full anode service in one order.
Magnesium is the correct alloy for freshwater environments, where zinc and aluminum anodes are too electrochemically passive to provide adequate protection. If you operate in saltwater or brackish water, see the aluminum alternative linked below.
Kit Contents
- CM762145 — Trim Tab Anode (1)
- CM806188 — Bearing Carrier Anode (1)
- CM821630C2 — Driveshaft Housing Anode (1)
- CM806190 — Trim Ram Anode (2)
Part Information
- Part Number: CMBRAVO1KITM
- Brand: Martyr Anodes
- Anode Material: Magnesium
- Kit Type: Complete Drive Anode Kit
- Best Use: Freshwater environments
Compatible Applications
- MerCruiser Bravo I Sterndrive
- Freshwater operating environments only
Choosing the Right Alloy
- Magnesium (this kit) — Freshwater use only
- Aluminum — CMBRAVO1KITA — Saltwater and brackish water
- Seachoice Bravo One Aluminum Anode Kit — Saltwater alternative
Parts Desk Insights
A full kit like this is the most efficient way to service Bravo I anodes — all the drive’s primary exposure points are covered in one purchase, and you avoid the common problem of replacing only the most visible anode while leaving a depleted one elsewhere on the drive. The most important thing to get right is the alloy: magnesium anodes in saltwater will deplete far too quickly and leave your drive unprotected, while zinc anodes in freshwater won’t corrode fast enough to do their job. If your boat moves between fresh and salt water, the aluminum kit is the better choice. Replace all anodes at each annual haulout or when any individual anode has worn to roughly half its original size.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.