A dispenser for an aerosol system for dispensing liquid material includes an outlet member, a collar member, an actuator member, and a selector member. The outlet member defines an outlet opening. The actuator member supports the collar member and the outlet member such that movement of the collar member relative to the actuator member causes the collar member to deform the outlet member. Movement of the selector member relative to the collar member causes movement of the collar member relative to the actuator member. Deformation of the outlet member alters a cross-sectional area of the outlet opening.