A dispenser system as in a foam-in-bag dispenser system with a smooth dispenser housing over which the film passes without interruption and which houses a mixing module with reciprocating rod and supports drive components of a drive transmission which is engaged with the rod for reciprocation within the mixing module. Also the drive transmission of a preferred embodiment includes a sliding crank mechanism covered by the dispenser housing and a motor is in driving engagement with the drive transmission with the motor being positioned external to the housing. The driver of the drive transmission for the rod also preferably functions to drive a physical outlet cleaning device and the housing also features a plurality of passages for receiving chemicals, a solvent and a heater unit.