the invention is a ball valve for controlling the flow of fluids between one of two inlets and an outlet . the two inlets are substantially coaxially located , permitting a single inlet point in a fuel supply vessel , yet still allowing two pickup points from within the vessel , such as for a “ main ” and a “ reserve ” source . the invention has a particular utility in fuel tanks for providing both a “ main ” and a “ reserve ” fuel source , such as for internal combustion engines .