A high loop should always be installed with the dishwasher drain line to prevent backflow of waste water to the dishwasher.
Dishwasher drain hose loop height.
The water can flow back into the dishwasher which will leave water in the bottom of the dishwasher.
This keeps the drain hose dried out and keeps any odors from backing up into the dishwasher.
The air gap or anti siphon prevents siphoning if sinks are drained simultaneously.
Some jurisdictions require an air gap device in which case the hose.
Video dishwasher high drain loop.
In the photo above right the dishwasher drain line was properly installed with a high loop and securely fastened to the underside of the countertop which also allows for the proper slope of the.
The purpose of a dishwasher air gap or anti siphon is to prevent the siphoning and back flow of water.
The high loop in the drain hose of your dishwasher is to keep water from settling in the hose if it were hanging down any lower or horizontally.
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If the drain hose is not elevated there is a potential for water to run the wrong way through your drain hose and can cause standing water at the bottom of your dishwasher.
If an air gap is not required the drain hose must have the high loop from the floor to prevent backflow of water into the dishwasher or water siphoning out during operation bosch.
Code requires that the hose connect to the sink drain on the sink side of the trap typically with a branch tailpiece.
Dishwasher hoses should have a high loop at least 20 inches above the finished floor to prevent wastewater from entering the appliance if the drain clogs.