The Toro 136-7119 Snow Blower Impeller Pulley transfers power from the drive belt to the impeller assembly in compatible snow blowers. This pulley mounts to the impeller shaft and rotates as the belt moves during operation. It works by converting belt movement into rotational force that drives the impeller, allowing snow to be discharged through the chute. Replacing a worn or damaged ... https://www.wholetoolbox.com/toro-136-7119-snow-blower-impeller-pulley