Of all the components used in this assembly the Valve Exhaust Main is the most expensive.
A sample from the products for the Exhaust Valve (model W) include: Screw(5x10), Lever,exhaust Valve No.2, Cap,exhaust Side Valve, Bolt(5x12).
The lowest price component in this Exhaust Valve (model W) parts-list fiche is the Bolt.