Abstract: A magnetic drive adapter for use with a plurality of outer drive magnet assemblies having various diameter drive hubs is disclosed. The magnetic drive adapter includes a hollow cylindrical portion having an external protrusion extending axially along the outer surface of the hollow cylindrical portion, and an internal protrusion extending axially along the inner surface of the hollow cylindrical portion. The internal protrusion mates with a drive shaft of a motor. The external protrusion mates with a cylindrical hub of an outer drive magnet assembly used in magnetically driven pump devices.