18-4133 is a K & L Supply part no. Honda part no for the CBR600 is 16950-MAL-602. (One is 3 times more expensive than the other) Pingel is 1311-CH.
K&L make two versions of this petcock that are direct interchanges for the OEM petcock. One is full manual manual, the other is manual and vacuum operated, both allow use of the stock Valkyrie petcock valve operating handle.