--- product_id: 264567861 title: "Martyr Rudder/Trim Tab Disc Anodes" brand: "martyr" price: "£70.16" currency: GBP in_stock: true reviews_count: 5 category: "Martyr" url: https://www.desertcart.co.uk/products/264567861-martyr-rudder-trim-tab-disc-anodes store_origin: GB region: United Kingdom --- # 3.75 inch OD zinc alloy Saltwater corrosion protection ISO 9001 certified quality Martyr Rudder/Trim Tab Disc Anodes **Brand:** martyr **Price:** £70.16 **Availability:** ✅ In Stock ## Summary > 🛥️ Stay ahead of corrosion—because your boat deserves the best defense! ## Quick Answers - **What is this?** Martyr Rudder/Trim Tab Disc Anodes by martyr - **How much does it cost?** £70.16 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/264567861-martyr-rudder-trim-tab-disc-anodes) ## Best For - martyr enthusiasts ## Why This Product - Trusted martyr brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Easy Installation Kits:** Includes all hardware and instructions so you can upgrade your vessel’s defense hassle-free. - • **Triple Alloy Versatility:** Choose from zinc, aluminum, or magnesium anodes tailored for salt, brackish, or fresh water environments. - • **Precision Pressure Diecast:** Manufactured under strict ISO 9001 standards ensuring consistent, high-performance protection every time. - • **Comprehensive Marine Shield:** Protects rudders, hulls, propellers, shafts, and more—your boat’s ultimate corrosion barrier. - • **Military-Grade Alloy Purity:** Crafted from US Mil Spec zinc alloy, free from iron impurities for unbeatable corrosion defense. ## Overview Martyr Rudder/Trim Tab Disc Anodes are premium zinc alloy sacrificial anodes engineered to provide superior cathodic protection for ocean-going vessels. Manufactured to US Military Specifications and ISO 9001 standards, these 3.75-inch diameter anodes prevent corrosion on metal components exposed to saltwater, brackish, and fresh water. Trusted by professionals, Martyr offers durable, impurity-free alloys that safeguard rudders, hulls, and marine equipment, ensuring longevity and peace of mind on every voyage. ## Description Martyr Anodes provide low cost marine cathodic protection for boats, marine structures and boat equipment. Often called "Boat Zincs”, Martyr Anodes are made of a specialized alloy based on the US Mil Spec using only high purity metals. Martyr is the only manufacturer that offers all three alloys that protect your boat from corrosion that can occur in salt water, brackish water and fresh water. Martyr anodes are pressure diecast and manufactured to strict quality standards through an ISO 9001 Quality Management system and are guaranteed to be manufactured to US Military Alloy Specifications. Martyr manufactures sacrificial zinc anodes, aluminum anodes, and magnesium anodes, all of which are proven to prevent boat corrosion that leads to pitting to the hull plate, rudders, and bilge keels. Martyr anodes also protect propellers, shafts, shaft brackets, stern tubes, engines and rudders. Martyr provides anode kits that include all installation hardware and instructions. For more information visit www.martyranodes.com. Review: It does what it said on the tin Review: Aimé la robustesse du produit, mais un peut petit ## Features - Zinc alloy for use in saltwater - Martyr Anodes offer maximum protection by maintaining quality alloys, free from impurities like iron, which can compromise performance - Provides low cost cathodic protection of ocean-going vessels, structures and equipment constructed of iron, steel, aluminum, magnesium, and other metals - High-quality Martyr anodes are pressure diecast and manufactured to strict quality standards through an ISO 9001 Quality Management System - 0 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001444VMO | | Batteries Included? | No | | Brand | Martyr | | Color | magnesium | | Customer Reviews | 4.7 4.7 out of 5 stars (314) | | Date First Available | 6 November 2013 | | Drive System | Internal Hex | | Is Discontinued By Manufacturer | No | | Item model number | CMR03 | | Manufacturer | Martyr | | Material Type | Zinc | | Number of Items | 1 | | Number of Pieces | 1 | | Product Dimensions | 9.91 x 9.65 x 4.06 cm; 716.68 g | | Size | 3.75 inch OD | | Sport | Boating | | Style | Zinc | | Weight | 0.72 Kilograms | ## Product Details - **Exterior finish:** Zinc - **Head style:** Trim - **Item dimensions L x W x H:** 9.9 x 9.6 x 4.1 centimeters - **Material:** Zinc - **Point style:** Type AB Point ## Images ![Martyr Rudder/Trim Tab Disc Anodes - Image 1](https://m.media-amazon.com/images/I/81OdKriMNQL.jpg) ## Questions & Answers **Q: Is this a pancake anode? Does it have the top and the bottom anode?** A: I ordered two not being sure what the configuration was. These are pancake anodes - flat on one side and domed on the other. They apparently come in pairs where a QTY of 1 gets you two anodes connected together with a screw that can be easily separated to expose the flat side. I received two pairs with a QTY of 2. **Q: The listing says this is for a cmr 5, but the picture shows a cmr 3. which is it?** A: It is a CMR5. It is 5" in diameter and 3/4" thick. I put them on my Bennett trim tabs, replacing the old original factory anodes. Fit perfectly. **Q: Will this work to prevent galvanic corrosion between steel and aluminum that is not in the water?** A: I don’t believe it will **Q: How many pieces come with an order, 2?** A: Yes. 2. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by T***G on 16 April 2021* It does what it said on the tin ### ⭐⭐⭐⭐⭐ Review *by R***T on 26 March 2022* Aimé la robustesse du produit, mais un peut petit ### ⭐⭐⭐⭐⭐ Review *by A***Y on 12 September 2025* Works great ## Frequently Bought Together - Martyr CMR Rudder/Trim Tab Anodes - Martyr Anodes, Streamlined Shaft Anodes with Stainless Steel Slotted Head - Martyr CMDIVERA, Aluminum Alloy Pleasurecraft Divers Dream Slotted Bolt-on --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/264567861-martyr-rudder-trim-tab-disc-anodes](https://www.desertcart.co.uk/products/264567861-martyr-rudder-trim-tab-disc-anodes) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-30*