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Jorlu,
I thought of the check valve. But when you want to drain your tank you have to hold it open to let water drain. Something you may not have thought about.?? And sure I could do that but you like to keep it "simple" right?
And please explain to me how the scales go back into a pump when the hose is connected to the pump and in the air?? Not sure how this is confusing for you??
I don't know Spanish but basically I'll be lifting the end of the hose (STILL CONNECTED TO THE PUMP) out of the tank when I don't want the tank to drain.
It will really make sense to you if you don't think about it.
😬
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