Where must overflows drain if they are located on a fixture?

The correct answer indicates that overflows from fixtures must drain into the inlet (fixture) side of the trap. This is essential for maintaining proper plumbing function and system integrity.

When an overflow occurs, it is designed to prevent excess water from spilling onto the floor or causing damage in case of a blockage or malfunction. By routing the overflow to the inlet side of the trap, it ensures that any excess water can still flow into the drain system. The trap serves a crucial function; it not only prevents sewer gases from entering living spaces but also helps to manage excess water from fixtures.

If the overflow were to drain outside the building or into the drainage system, it could pose several issues, such as cross-contamination or potential flooding, and would not fulfill the purpose of the overflow mechanism. Therefore, routing the overflow in this manner contributes to both safety and sanitation within plumbing systems.