Aladdin 940 9-3/8-Inch Weir Replacement for Baker Hydro Pool and Spa Skimmer Weirs replacement Fits Baker Hydro pool and spa skimmer Weirs allow water to flow into the skimmer Close down when the pump shuts off preventing the back-flow of debris from returning to the pool The string release style works by simply positioning the weir into place and pulling out the string at each side