Zinc Grouper Anode from CANADA METALS
Supplements your boat's existing anodes An excellent anodic device to supplement a vessel’s existing anode system, especially to counteract stray current from defective shore power. Clip to bolt on outdrive. Clip to grounding strap if possible or wire items together with copper wire and clip to wire. Do not connect to negative battery terminals. Dimensions: 8 1/4"L x 3 1/4"W x 1 3/8"D.