Martyr Zinc Pencil Anode 3/8 NPT CMT-CME1Z
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Martyr CMT-CME1Z is a zinc pencil anode with brass plug designed for marine engine cooling-system corrosion protection. Martyr’s CME series is built for engine cooling-system use, with the anode sacrificing itself to help protect internal metal components from galvanic corrosion. Current Martyr sizing data for the CME1 configuration shows a 3/8 NPT plug size with a 1/2 inch diameter zinc anode and 2 inch anode length.
Key Features
- Martyr zinc pencil anode with brass plug.
- 3/8 inch NPT plug size.
- 1/2 inch anode diameter.
- 2 inch anode length on the CME1 size.
- Complete assembly includes the brass plug and replaceable zinc anode.
- Built for engine cooling-system corrosion protection.
Engine Compatibility
This is a size- and thread-specific cooling-system anode, not a model-specific engine part by description alone. It is intended for marine engine cooling-system applications that require a 3/8 inch NPT pencil anode assembly in the CME1 size. Always match by the original anode dimensions, plug thread, and the engine manufacturer’s parts reference before ordering.
Serial Number Fitment Notice
Cooling-system pencil anodes can vary by plug thread, anode diameter, and visible length. Always confirm CMT-CME1Z / CME1 against the exact engine, heat exchanger, or cooler application before ordering. Matching the original 3/8 NPT plug size and 1/2 inch x 2 inch anode dimensions is the safest fitment check.
When This Part Needs Replacement
Replace this pencil anode when it is heavily consumed, reduced in diameter, brittle, broken, or coated to the point that it can no longer protect the cooling system effectively. Pencil anodes are service items and should be inspected regularly because they are designed to sacrifice themselves before more expensive engine and cooling components corrode.
Installation Notes
Install only in the correct matched application using the proper 3/8 NPT threaded port. Inspect the old plug, threads, and sealing area before installation, and make sure the replacement matches the original size and exposed anode length. West Marine’s current guidance for Martyr pencil anodes also notes that the listed anode length refers to the visible portion of the anode when installed in the plug.
Alternate/Superseded Part Numbers
Current source coverage identifies this item primarily as CME1 / CME1Z in Martyr product listings. The CMT-CME1Z format appears to be a catalog-style SKU variant tied to the same Martyr CME1 zinc pencil anode with brass plug configuration.
Parts Desk Insight
Pencil anodes are small parts, but they do important work inside raw-water and cooling-system passages where corrosion is easy to miss until damage is already done. Replacing them on schedule is inexpensive protection compared with the cost of heat exchanger, cooler, or engine cooling-system repairs.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.