What is the purpose of an indirect waste line?

The purpose of an indirect waste line is to create a gap, or air gap, between the food preparation sink and the waste line. This design is crucial for preventing contamination of the water supply with waste materials. The air gap ensures that any wastewater from the food prep sink cannot siphon back into the potable water system, which is vital for maintaining health and safety standards in food service establishments.

An indirect waste line allows for proper drainage while safeguarding against potential hazards like backflow, which could lead to the contamination of drinking water. The separation between the sink and the waste system is a critical component of plumbing safety regulations, thereby ensuring compliance with health codes and reducing the risk of foodborne illnesses.