Yes, I've noticed that the women generally take over a lot of space and get things their way, or you end up suffering the consequences. If you're really worried about the higher holding tank, up forward, you could put either a check valve or a ball-valve into the hose to prevent a failure of the joker valve from dumping waste into the head.
Unless you've designed the holding tank poorly, an anti-siphon valve isn't needed, since the air vents in the holding tank will break any siphon effect, unless you've over-filled the holding tank, in which case—you're basically screwed anyways.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.