This is a updated float for all SU H-Series carburators, H4, H6, HD6, HD8. Tired of the current floats that crack and fill with fuel? We were, too. Our new floats are molded from a modern, American-made material called NitrophylÆ, which is now specified for just about every modern fuel float. It will not crack or absorb fuel and is immune to a variety of fluids, including the new fuel formulations. Eliminate warranty issues and unhappy customers!