What is the correct name for the component that loops under the cabinet to prevent backflow from a dishwasher?

What is the correct name for the component that loops under the cabinet to prevent backflow from a dishwasher?

• A. Air gap
• B. Backflow preventer
• C. Loop in the dishwasher drain hose
• D. Check valve

Answer: (C)

The loop under the cabinet is the high loop of the dishwasher drain hose. By routing the hose up to a high point before it connects to the drain, it creates a physical rise that makes it harder for wastewater to siphon back into the dishwasher. This looping isn’t a valve or separate device; it’s simply the hose being positioned to prevent backflow. The other devices—an air gap, a backflow preventer, or a check valve—are active components, whereas the loop itself relies on position and gravity to reduce the chance of backflow. So, the term describes the actual component: the loop in the dishwasher drain hose.

The loop under the cabinet is the high loop of the dishwasher drain hose. By routing the hose up to a high point before it connects to the drain, it creates a physical rise that makes it harder for wastewater to siphon back into the dishwasher. This looping isn’t a valve or separate device; it’s simply the hose being positioned to prevent backflow. The other devices—an air gap, a backflow preventer, or a check valve—are active components, whereas the loop itself relies on position and gravity to reduce the chance of backflow. So, the term describes the actual component: the loop in the dishwasher drain hose.