This Engine Water Pump with Gasket is a direct replacement for Ford F-150 2001-2003 and F-150 Heritage 2004 with 5.4L V8 engine. The housing material is made of cast iron and the impeller material is steel. It has 7 impeller vanes and is belt driven. This product comes with a gasket and has a manufacturer warranty of 1 year. The California Prop 65 Warning applies to this product. It is compatible with the manufacturer part numbers W9273M, 1L3Z8501BA, F7TEAA, WP9273, 1256010, and 1L3Z8501AB. The other part number is 41121 and the interchange part number is AW4125. Note that this product fits the Ford F-150 Lightning model built from 11/10/00.