Quote:
Originally Posted by Marty Levenson
Hello - haven't posted for quite a while, but still learning a lot by lurking!
A dozen years ago I replaced my exhaust system, using black steel. It is rusting out now (salt water), and I wonder about other replacement options. I know not to use galvanized, so am considering brass or copper. Are those insanely expensive? Any other downsides? Does it have to be 1 1/4"....could I save money by using a smaller diameter, or would that risk back pressure? The muffler is plastic.
I'll probably end up with the black metal again as it will likely outlast my sailing years. If so, what is the best thread sealant to use?
Many thanks in advance.
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You never want to use brass fittings in a salt water system. The salt water will dissolve the zinc in the brass leaving behind a weak honeycomb of pure copper. You will not see this from the outside of the fitting (all will look fine) but the inside is being eaten away until the fitting snaps off. Bronze is the better choice.