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No drainage piping conveying soil or waste from water closets or urinals shall be connected to any combination waste and vent system: nor shall such waste pass through any part of the combination waste and vent system.

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915.2.2 Vents, Restricted Waste
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Sinks shall be provided with waste outlets a not less than 11/2 inches (38 mm) in diameter. A strainer or crossbar shall be provided to restrict ...