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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Cost of Contact Lenses Compared With Eyeglasses. Some experts suggest the average cost of prescription eyeglasses is less than $300. If this is true, contact lenses cost more. Also, many people who wear eyeglasses do not purchase new glasses every year. But the cost of eyeglasses can increase significantly if you choose premium features, such as high index lenses, progressive lenses, anti-reflective coating and designer frames.