A foam chemical dispenser device that includes a dispenser housing having a body portion defining a mixing module reception area, and a mixing module positioner adjustably supported by the dispenser housing between a mixing module hold position and a mixing module access position. Further included is a finger releasable locking device which, when in a locking mode, locks the mixing module positioner in the hold position and when in a release mode provides for positioner adjustment to the access position. Also included is a dispenser having a dispenser housing with a chemical inlet section and a chemical outlet section, and a closure device dimensioned for contact with a mixing module positioned to receive chemical from the chemical outlet section of the dispenser housing, and the closure device being pivotable between a mixing module hold position and a mixing module access position. A method of accessing a mixing module of a dispenser is also featured including releasing a finger release locking device locking a closure device from a mixing module locked in position mode to a mixing module access mode and preferably vice versa.