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which fresh water inlet?
if you are talking about the one to fill the tank, there probably is no water in it
if you are talking about the 'city' connection, might be worth it, but if you used the pump to pump the stuff through the only thing that might break is that short section of hose (wall to the pump area) and being in AZ i would venture to guess there probably isn't any water in that piece just due to evaporation anyways..
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