The Fleck high flow bottom distributor basket (40922) is a very durable distributor basket that allows exceptional flows, while utilizing smaller slits. The bottom distributor basket works great for water softeners, iron filters, carbon filters, sediment filters, pH filters, and all other backwashing and upflow tank filter systems. It eliminates the need for gravel beds in fine mesh resin systems without sacrificing flow. It fits 1.05″ distributor tubes and has 326 total slots measuring just .008-.010 inches wide. It is a genuine Fleck part # 40922.