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Marelon vs. Bronze
Is your thrugh hull near the waterlin?. If you carry, marelon and get stucked on your thrugh hull, probably it couldn`t cope with your vessel´s weight. Moreover, heat melts marelon.
In any case, mu boat carried marelon for the last 8 years, and there were OK. I just changed them, because I thought there were old enough.
Mixing Marelon and bronze spherical valves is not recommende since both materials have disimilar rates of dilatation. However if you will only navigate in waters where it tempersature have a small amplitude, this will not be an issue.
Last, some guys recommend kicking your thru hull and valve after instalation with a ski boot. If it remains in place, means that it was ok.