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The Most Common Dishwasher Installation Defect
An improperly installed drain hose is by far the most common defect that I find with dishwasher installations, but it's also one of the easiest things to get right. In the photo below, which was featured as a Structure Tech Photo of the Day, there are several plumbing defects, two of which are related to the dishwasher drain.
Can you spot them?
Wrong side of trap Problem number one is that the drain is connected to the sewer side of the trap. The water that always sits in the bottom of the P-trap is what prevents sewer gases from coming in to the house. The dishwasher drain must be connected before the P-trap, not after it, which is what was done here. With this improper installation, sewer gases have the potential to come back in to the dishwasher. The diagram below right shows a proper installation.
No high loop In the diagram above, right, you'll notice that the dishwasher drain makes a high loop underneath the kitchen sink. This is the minimum requirement on every dishwasher drain installation - it's required by every manufacturer of dishwasher, and it's also required by the Minnesota State Plumbing Code (section 4715.1250). In fact, our plumbing code says "as ... more
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