The outer hull, or body, of the liner is a high strength forging. HC uses forgings exclusively to ensure the consistent quality. The sleeve is centrifugally cast in the HC facilities by skilled craftsmen. It has the maximum amount of chrome for the base metal and HC adds molybdenum to increase the hardness depth. The sleeve is then inserted into the hull at a tightness that exceeds its counterparts. The liner is rated to match the pressure rating of the pump per liner size.