I replaced a thru hull and seacock and replaced with bronze thru hull and marelon seacock, with a diverter valve above the marelon fitting for salt water wash down/toilet water supply through the same thru hull. My only concern is that it not be in a place where it would be subjected to contact that might break or damage the fitting. If it's in an out of the way and protected place (as mine is) it should be fine. If exposed I would be concerned about it. JMO
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