Join Date: Feb 2010
Location: Narragansett Bay
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Re: Unused Head
I just got to thinking, what do the outside of those deck fittings look like? Does the presumed water inlet have a female garden hose attachment? If not, it is probably just the vent, which permits air to replace product while pumping out. Venting also allows for proper decomposition of waste, but I'm not sure a porta potti tank is designed from materials to hold waste for very long and could permeate odor. If nuked with chemicals, as they are intended, it won't matter anyway, but they can smell like chemicals instead.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.