Your buying 1 Brand new fuel petcock, with sealing o-ring gasket,   fits buell blast 500, 2000-2009 models with the plastic tank like shown in the pic- this petcock is a simple on/off design, there is no reserve, we offer them with a reserve, however they cost twice as much, so these are by far the popular option. again your buying the petcock/fuel valve only   if you have any questions  2174540492. We can answer any question , thanks from motolane cycle salvage , illiopolis IL