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Originally Posted by mastermind2004
I believe that in this case it will essentially be unexposed to the main flow of the loop, and therefore not likely to cause galvanic corrosion.
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is it contact with the coolant that causes corrosion or cavatation in the coolant?
my understanding is that mere contact causes corrosion
remember it's a flow of electrons that we're talking about
cavatation can make it much worse, though i doubt we experience it at the low flow speeds and low temperatures found in wc systems
while using inhibitors will work (assuming he is AL free currently, big assumption) why add AL to a copper only system.
a good looking and effective fillport can made from plastic or copper parts bought at a local hardware store (not sure about in England) for less than the DD fillport