This gearbox is for the newer PowaKaddy trolleys with the smaller gearbox such as the Freeway II (FWII), Touch and the new Sport. 

For use with the Freeway 3, Freeway 5 and Freeway 7 this gearbox will work fine however you will not be able to connect the distance sensor

This gearbox is not suitable for Powakaddy models which have EBS (electronic braking system).