How to Install a New Dishwasher - The Spruce
2021-9-14u2002·u2002Drill Holes in the Cabinets . Before you can install the drain hose and water line to the dishwasher, you'll need to drill two holes in the sink base cabinet.For the drain hose, this is a 1 1/2-inch hole located near the back of the cabinet and as high as possible without hitting the sink.
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