The determine shows the vacuum clutch system. This kind of clutch takes advantage of the existing vacuum inside the motor manifold to work the clutch. The vacuum clutch contains a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Select a cloth that suits your preferences and go together https://clutch-kereta48136.theobloggers.com/39246591/a-simple-key-for-clutch-plate-unveiled