Patent ID: 7140388

Claim:
A dual ball air vent valve connectable to a sewer conduit, the valve comprising: an upper and lower housing sealed together; the upper housing in the shape of a dome having two cylindrical sections with a narrow section therebetween, the two cylindrical sections receiving the dual balls in an inner chamber, the dual balls spaced apart in the inner chamber by a shaft depending from a roof of the inner chamber, a cylindrical skirt below the dome forming an outer periphery of the upper housing, the skirt penetrated by oppositely positioned side openings; the lower housing having a cylindrical shaped outer wall, a top shelf and a lower shelf below the top shelf, the top shelf penetrated by two adjacent circular openings each opening containing an O-ring adapted to seat the ball and another opening adapted to permit passage of sewer gases from the conduit; the lower housing lower shelf communicating with ambient air through oppositely positioned openings in the lower housing outer wall, an interior wall separating the lower shelf into two chambers, each chamber receiving a lower portion of the ball; the oppositely positioned openings in the upper housing skirt contiguous with the oppositely positioned openings in the lower housing outer wall; and a lower portion of the lower housing adapted to be connected to the sewer conduit.