Product Description Specifications This kit includes all the components necessary for the complete overhaul of the Athena cylinder exhaust valve. The kit includes: the valve, the diaphragm, the springs for the valve control and all the hardware required for installation. Category: Exhaust, Mufflers & Tips>Exhaust Valve Controllers Core: N LTL: N MPN: S410485303011 Proposition 65: N Special Order: Y Clearance Item: N