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thanks for the info marc!...
and skip the check valve? i cant do that, its the only minor (major)safegaurd against iminant flooding should the power go out! sure theyre not reliable, but its the only way i can think of. one idea i had was to buy 2 true union check valves, and every month, swap out out valves. that way i could clean one of the valves in vinegar, while the other one is in operation. i would think that would keep them in good working order? by the way, thoes things dont have a minimum operating pressure do they?
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chrismunn
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