An island sink fixture connects to a two-inch waste line and a one-and-a-half-inch vent loop using forty-five-degree elbows. The horizontal waste pipe slopes downward at a minimum of one-quarter inch per foot. A one-and-a-half-inch foot vent connects back to the main vent riser near the nearest wall at a one-quarter inch per foot slope. Two accessible cleanouts are positioned typically on the piping, and a wall cleanout with an access cover is installed above the floor on the vertical riser.
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