This exhaust gasket is a simple crush washer, for use on all Cleveland CycleWerks 250cc air cooled motors.  If you are installing a new exhaust, reinstalling your old exhaust or have a leak, you know the deal, install a new gasket and your issues is solved, like magic, only not magic, mechanical knowhow.  Yeah we are sort of stretching here, not much else to say about an exhaust gasket.