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I have a anti-siphon valve on the salt vater intake on my toilet, as recomended by the manufacturere. The mounting instruction states that if the top of the bowl is below the waterline a anti-siphon valve is recomended.
the hose between the pump and the bowl is lead above the waterline with a 180 degree bend having at anti-siphon valve.
In practical use there is no water leaking from the valve, problems with suction is solved since the valve is placed after the pump.
I almost had a bot sink for me because there was no anti-siphon valve and we forgot to close the water intake when leaving thye boat.
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