You have seawater running through the pipes. Your zinc will protect the bronze fittings if they are electrically at the same potential as the zinc. In other words, they must be grounded. If you have a plastic nipple or thimble in your manifold, you will insulate some of the metal pipes. If you have the whole thing connected to the through-hull using a rubber hose, the whole thing will be unprotected. IYou can fix this by bonding the metal parts. The same thing applies to raw water strainers, V-drive, and anything else that transports seawater. f you use Teflon tape to assemble your manifold, you will insulate the fittings. I think pipe dope would be OK.
While typing this, I thought of a problem with my engine installation. The transmission oil cooler is painted. It uses seawater to cool the transmission fluid. Although it is in contact with the engine block via mounting hardware, the paint might insulate the cooler. I need to make sure that it is properly grounded.
I still think that the fittings used for home sprinkler systems might be a good choice. I’ll have to look at them the next time I’m at home depot. The valves might not be up to standard, but the thimbles might.
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Rich Carter
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