Aluminum through-hull fittings

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safetyfast

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I would like to replace my below the water line through-hull fittings. Currently the ones in there are plastic or nylon. Of course, I want to avoid galvanic corrosion. I came across these on eBay. https://www.ebay.com/itm/3-4-Aluminum-Bilge-Fitting-Silver-57-4012-/121550475481?_trksid=p2141725.m3641.l6368 Anyone try them? Do you know of a source for additional sizes?
 
Check w/ the Seller or buy one in the size you need that is made of 'Marelon' by the Forespar Company. It is a super polymer composite that is compatible w/ tin boats, won't disintegrate like plastics, is impervious to UV damage and is as good as naval bronze in marine applications.
 

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