My first boat with the little mercruiser had an anode on the lower unit.

Anyone implement one on a jet or are they deemed unnecessary in local lakes or on the Colorado?

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Really depends n how much time it will spend in the water.....Just like the Mercruiser...

We put a few anodes on my buds Fish Rite with a Dominator, two on the jet pump and one on the hull with one on each aluminum trim tab because it spends 5 months out of the year in the water and about three weeks in and out of the ocean during salmon season...

GT