White Gear 420A20 for Autotrol 440 and 440i Timer Assemblies.
Used in older version ( like 1550TC ), and not the 440iHV Revised version.
So, make sure this gear is the one you need before ordering.
Limit amount in stock, as this is an obsolete item.Click to Enlarge Diagram
Or SEE > 440 and 440i Timer Repair Guide