Sanitary waste and vent piping configuration for the men's lobby restroom containing two lavatories, one urinal, two water closets, and one floor drain. The fixture branches connect to a main sanitary line sized up to four inches with respective trap sizes of one and one-quarter inches for lavatories, two inches for the urinal, and four inches for water closets. Vent piping extends upward from each fixture, combining into two-inch and three-inch vent stacks leading to a vent through roof termination. The main sewer line connects downstream as detailed in the primary plumbing plans.
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