Hayward SX180DA Lateral Assembly with Center Pipe Replacement for Select Hayward Sand Filter Lateral assembly with center pipe replacement Fits only hayward pro series sand filter model s180t Also compatible with s210t1580 series high-rate sand filter Weighs 2.1-pound High-rate sand filters use a special filter sand normally .45 to .55mm (also known as pool-grade #20 silica sand)