I would spend the money and get an all stainless one. Plastic has a way of falling apart in time in the sun and salt air. I bonded/grounded mine to the backside of one of the mounting bolts. I have a 10 gauge wire running to the bonding tab on the tank and another run to the negative buss bar.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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