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1. A surface cleaning apparatus, comprising:
a housing adapted for movement across a surface to be cleaned; a supply tank for holding a supply of liquid; a distributor fluidly coupled to the supply tank for delivering a fluid to the surface to be cleaned; a regulator tank fluidly coupled to the supply tank for regulating the flow of liquid out of the supply tank, the regulator tank comprising:
a chamber for holding a volume of liquid from the supply tank and a volume of air; anda vent in fluid communication with ambient air for venting ambient air into the chamber; an outlet in fluid communication with the distributor; a conduit extending between the supply tank and the outlet; and at least one port provided in the conduit and in fluid communication with the chamber, wherein, as liquid flows out of the supply tank, the at least one port exchanges liquid and air between the chamber and the supply tank to regulate a steady flow of liquid through the outlet regardless of the volume of liquid in the supply tank.
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