A waste and vent that serves a kitchen sink, a garbage disposal, a dish washer, or other fixture installed for culinary use, or one that receives the discharge from a clothes washing machine may not serve as a wet vent for any other fixture.(9) Stack Venting.(a) Plumbing Fixtures at the Top Interval of a Stack.Plumbing fixtures at the highest level may enter into a three-inch soil or waste stack.T