Magnesium for fresh water only.
- High-quality, cadmium-free anodes
- Higher protection than zinc
- 2.5 Times lighter than zinc
- Corrodes less than zinc
- Ideal for aluminum hulls
- Installation hardware included
| Brand | Seachoice |
| Case | 15 |
| Material | Magnesium |
| Model | R4 |
| Size | 5" dia. x 5/8" |