FWIW I just looked at my plumbing. No hepvo valve. The bathroom sink has its own connection to tank. The shower with p-trap and kitchen sink are t'd to another connection to tank. The tank vent is t'd to the shower drain pipe. I do have 2 grey tanks. One must handle galley and shower and is vented.
One then handles bathroom sink; this tank has no apparent vent. That doesn't seem right. I'll look some more.
One then handles bathroom sink; this tank has no apparent vent. That doesn't seem right. I'll look some more.
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