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a check valve isn't going to do anything on a drain, as water can't flow up anyway. I try to avoid relying on check valves if at all possible anyway.
If you have an overflow box, not a whole lot of water can come out of the drain once you turn off your return pump. I'm not exactly sure what type of emergency you are preparing for.
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-Scott
Whenever I’m about to do something, I think “would an idiot do that?” and if they would, I do not do that thing
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