Hughes Performance Oil Pumps and Parts are carefully machined to the high standards and exacting tolerances set by Hughes Performance. Hughes Performance Oil Pumps incorporate a Hughes Performance in-house designed pump bearing assembly for less drag and horsepower loss, while still yielding a better mile-per-hour output than the more commonly used thrust washer types. All Hughes Performance Oil Pumps come with gasket, o-ring sealing rings, new Hughes Performance pressure regulator springs, and gear set.