A dishwasher drain pipe is a crucial component of a dishwasher system, responsible for draining used water and preventing sewer odors or insect entry. It typically connects the dishwasher’s drain pump to the kitchen’s drainage system. Dishwasher drain pipes are available in various materials like PVC, metal, and rubber, each with its advantages and disadvantages. They come in both corrugated and rigid forms, allowing flexibility or durability as needed.