A plumbing riser diagram indicates the routing and sizing of sanitary, vent, and drain piping with designated pipe diameters. A 3-inch sanitary stack, a 3-inch vent pipe, a 4-inch roof drain, a 4-inch outside diameter pipe, and a 1-inch condensate line are coordinated at intersecting alignment axes. Piping connections are indicated by numbered hexagon callouts for reference within the plumbing drawing set.
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