In a plumbing system, what is the function of a fixture drain?

The function of a fixture drain is specifically to carry waste away from fixtures, such as sinks, toilets, and showers, to the main drainage system. This component is crucial in maintaining sanitary conditions within a plumbing system, as it helps prevent the accumulation of waste and water at the fixture, which could lead to hygiene issues or backflow problems. Fixture drains are designed to efficiently transport wastewater to sewage systems or septic tanks, thereby playing a vital role in the overall plumbing infrastructure.

The fixture drain is not responsible for supplying fresh water to fixtures, ventilating the drainage system, or purifying wastewater. Instead, it focuses solely on the removal of waste, ensuring that the plumbing system functions properly and safely.