![how to replace a dishwasher drain hose how to replace a dishwasher drain hose](http://i.ytimg.com/vi/txcL_naWHCs/maxresdefault.jpg)
I’ve heard different reasons for why an additional loop is required under the sink, so I decided to contact the manufacturers directly.
How to replace a dishwasher drain hose manual#
And here’s a diagram from the dishwasher manufacturer showing the same thing.Īlthough new dishwashers come from the manufacturer with the drain looped up at the side of the dishwasher, every installation manual still requires this high loop underneath the sink. But first, here’s a photo showing what a high loop looks like.Īs you can see, the dishwasher drain hose is fastened as high as possible underneath the counter. Hang on, I’ll come back to that in a minute. However, that’s not what we require here in Minnesota. This is the minimum requirement for every dishwasher drain installation it’s required by every dishwasher manufacturer, as well as section P2717.2 of the International Residential Code. In the diagram above, you’ll notice that the dishwasher drain makes a high loop underneath the kitchen sink. The diagram below right shows a proper installation.
![how to replace a dishwasher drain hose how to replace a dishwasher drain hose](http://i.ytimg.com/vi/cALQ3PR7k30/maxresdefault.jpg)
With this improper installation, sewer gases have the potential to come back into the dishwasher. The dishwasher drain must be connected before the P-trap, not after it, which is what was done here. Water always sits in the bottom of the P-trap, and this prevents sewer gases from coming into the house. The first problem is the dishwasher drain is connected to the sewer side of the trap. Two of these are related to the dishwasher drain. In the photo below, which was featured as a Structure Tech Photo of the Day on our Facebook page, there are several plumbing defects shown. An improperly installed dishwasher drain hose is the most common defect we find with dishwasher installations, but it’s also one of the easiest things to get right.