A. The short answer here is âUsually- yes.â A check valve is a one-way valve. It gets installed in the discharge pipe of your sump pump. When the pump runs, the water is forced out through the valve. When the pump shuts off, gravity wants the water in the discharge pipe to fall back into the sump pit.
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Best Answer: You don't  tell the optician anything. You bring the prescription and he will see for himself. They won't make your safety glasses without having the actual prescription. Yes, 60 is the total, or single PD for distance vision.