Abstract: A dispenser for dispensing a metered dose of foam or liquid from a reservoir, includes a housing, and a replaceable liquid reservoir seated within the housing. A pump mechanism is attached to the reservoir and includes a dispensing nozzle oriented to dispense the metered dose from the reservoir upon actuation of the dispenser by a user. The pump mechanism is attached to a neck of the reservoir with a locking mechanism configured to engage and lock the pump mechanism at a desired position relative to the neck. The locking mechanism may also prevent subsequent removal of the pump mechanism from the neck.