Furuno CI-88 Installation Manual page 23

2. MOUNTING
2.4.3 Mounting the anti-corrosive zinc plate
When flush mounting the transducer into the keel, attach the anti-corrosive zinc plate
(shipyard supply) to prevent the electronic corrosion.
Narrow keel
Make holes on the keel and transducer casing, attach the anti-corrosive zinc using the bolts
and nuts (supplied).
Wide keel
Fasten an end of the earth wire between thru-hull pipe and jubilee clip (supplied). Attach a
crimp-on lug to another end of the earth wire, and then fasten it with the anti-corrosive zinc
using the bolt and nut (supplied) as bellow.
2-13