This is the 60 pin chain for the ‘chain and sprocket’ driven feed systems on the Advance, Accentra-Cast, and XXV pellet stoves and is the updated design to be used on all chain driven feed systems.
The early versions of this feed system used a smaller primary gear (motor sprocket) and a larger secondary gear (auger). As of 2013, that system was updated to accommodate a 1:1 gear ratio using two 3 1/2″ sprockets. If you have the old version, you need to update your stove as all of the older parts are obsolete.