What is the term for a piping arrangement where the drain from another fixture discharges into another fixture above the flood level rim?

The term for a piping arrangement where the drain from one fixture discharges into another fixture above the flood level rim is referred to as an Air Gap. An Air Gap is a critical plumbing installation that prevents the backflow of water and potential contamination of the potable water supply. By creating a physical separation between the end of the discharge pipe and the flood level rim of the receiving fixture, it ensures that there is no possibility for wastewater to siphon back into clean water systems due to changes in pressure or backflow events.

This concept is essential for maintaining safe and sanitary conditions in plumbing systems, especially where cross-contamination could lead to health risks. Other options such as an Overflow Pipe or a Siphon Break have different functions; for instance, an Overflow Pipe is designed to carry excess water away from a tank or fixture to prevent overflowing, while a Siphon Break is a method to prevent siphoning in plumbing systems without creating an actual gap. A Drain Trap, on the other hand, is installed to prevent odors from the sewer from entering buildings but does not address the specific scenario involving fixture discharge.