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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Glasses can cost just $8 or up to $600 for those without insurance. For name brands, prices can range between  $50 and $1,000 or more. At an eye doctor's clinic, prices for eyeglasses will vary depending upon the frames, lenses and region of the country. The average price for eyeglasses nationally is $196, according to Vision Service Plan . Discount retailers, such as LensCrafters or Pearle Vision, offer a range of options. Prices range from $159 for standard, metal-alloy frames to more than $500 for designer frames.