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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State board recommendations vary between different states, but generally glasses prescriptions are only valid for two years, and contact lens prescriptions are typically only valid for 1 year (some states may vary). Even those who feel that nothing has changed should have regular check ups.