Combination drain sump and air pressure chamber for automatic clothes washing machine

In a washing machine having an air pressure responsive switch, a tub for holding washing liquid, and a pump for removing the liquid from the machine, the combination of a drain sump and air pressure chamber member comprising:

• a sump member having an upper portion, a lower portion, a side wall, and a bottom wall, said sump side wall having an outlet opening above the lower portion in liquid flow communication with the pump,
• an open-ended dip tube in liquid flow communication with the tub and extending downwardly within the sump side wall below the outlet opening and into the lower portion and spaced from the sump side and bottom walls,
• an air pressure chamber member located laterally of and above the sump, said air chamber having an open base, a side wall and a top end wall with an air port, and
• a connecting chamber member in communication at one end with the base of the air chamber and at the opposite end with the top of the sump member in close proximity to the outlet opening, said connecting chamber member having a major portion thereof located above the sump outlet opening sufficient to remove liquid from the connecting chamber prior to removing liquid from the lower portion of the sump member when viewed in vertical cross-section and having a width in its entirety at least substantially equal to the width of said air chamber base and a height sufficient to provide a substantial cross-sectional flow area.