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Martyr Zinc Pencils for inboard and stern drive engines. The sacrificial pure zinc rod prevents galvanic corrosion on internal engine parts. Anodes are sold with a brass end plug. UNC size anode thread screws into the plug. NPT size plug thread screws into engines, heat exchangers, pipes, condensers, water cooling jackets, etc.
Zinc anodes should be checked periodically and replaced when only 1/3 of zinc rod remains.
| Model | Size" | NPT" | UNC" |
|---|---|---|---|
| MTR CME00 | 1/4 x 2 | 1/8 | 1/4 |
| MTR CME00 | 3/8 x 1 3/4 | 1/4 | 5/16 |
| MTR CME1 | 1/2 x 2 | 3/8 | 3/8 |
| MTR CME1D | 1/2 x 1 3/4 | 3/8 | 3/8 |
| MTR CME1E | 1/2 x 1 1/2 | 3/8 | 3/8 |
| MTR CME1F | 1/2 x 1 1/4 | 3/8 | 3/8 |
| MTR CME2 | 5/8 x 2 | 1/2 | 7/16 |
| MTR CME3 | 3/4 x 2 | 3/4 | 1/2 |
| MTR CME4 | 3/4 x 3 3/8 | 3/4 | 1/2 |
| MTR CME5 | 3/4 x 3 5/8 | 3/4 | 1/2 |
| MTR CM272100200300Z (Yanmar) | 1 x 1/8 | 3/4 | 3/8 |
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