An island sink connects to a one-and-a-half-inch drain and trap, transitioning into a two-inch combination drain and vent pipe below the cabinet. The piping drops through the floor to a two-inch horizontal drain line and routes to a vertical one-and-a-half-inch vent installed inside a wall. An allowable vent offset is positioned six inches above the flood level rim of the sink.
ISLAND SINK 2" COMBINATION 1 1/2" DRAIN OFFSET ALLOWABLE VENT 6" WALL VENT IN CABINET 2" 1 1/2" 2" DRAIN & VENT & TRAP
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