The figure displays the vacuum clutch system. This sort of clutch makes use of the existing vacuum while in the engine manifold to work the clutch. The vacuum clutch is made up of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  This helps prevent the transmission shaft https://keeganrzbeg.blog4youth.com/33639005/helping-the-others-realize-the-advantages-of-clutch-kereta