Dishwasher installation requires precision

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Q: I am installing a dishwasher and a garbage disposal in my home. The dishwasher instructions include two ways of installing the drain hose. The simpler way is to attach it at the sink waste, before the trap. The other way seems more complicated and costly to attach it to an air gap that then attaches to the garbage disposal. I would prefer the first option. What are the pros and cons of each way? A: The purpose of an air gap is to prevent wastewater from siphoning from the disposal into the dishwasher. The same thing can happen if you improperly install the drain hose directly to the drain, even if you attach it to an inlet above the trap. An air gap is exactly what it sounds like. It is a small fixture that attaches to the top of the sink (or sometimes the countertop) that breaks the flow of wastewater as it moves from the dishwasher to the house's drainage system. Two small lengths of pipe extend from the bottom of the fixture. One acts as an inlet, and the other acts as an out...