Master Plumber Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The drainage of a refrigerator, particularly one used for food storage, should utilize an indirect waste pipe. This is necessary for a few reasons. First, an indirect waste connection provides a way to direct the wastewater from the refrigerator into the drainage system without the risk of backflow contamination. It ensures that wastewater is safely and effectively removed, reducing the potential for foodborne illnesses or other health hazards linked to improper disposal of wastewater.

An indirect waste pipe typically connects to a sink or some other indirect drain outlet, allowing for proper ventilation and preventing any connection that could lead to siphoning contamination. This method is also in line with plumbing codes, which prioritize health and sanitation in the handling of wastewater from food storage appliances.

The other options suggest alternatives that don't adequately address the safety and hygiene considerations essential for appliances storing food. Therefore, using an indirect waste pipe is the most appropriate method for draining a food storage refrigerator.