Connecting a Dishwasher to Your Plumbing

Water Supply Connection

Dishwashers connect to the hot water supply under the kitchen sink. You will need a dual-outlet shut-off valve or a separate dishwasher valve connected via a tee fitting to the existing hot water supply line. Use a 3/8-inch compression fitting on the valve and a braided stainless steel dishwasher supply line to reach the dishwasher inlet valve (located at the bottom of the unit behind the lower access panel). The supply line typically runs through a hole drilled in the shared cabinet wall between the sink cabinet and dishwasher space.

Drain Connection

The dishwasher drain hose connects to either the garbage disposal inlet (if you have one) or a dishwasher tailpiece on the sink drain. If connecting to a garbage disposal, remove the knockout plug from inside the disposal first, then secure the drain hose to the disposal inlet with a hose clamp. The drain hose must loop up to the underside of the countertop (creating a high loop) or connect through an air gap device mounted on the countertop — this prevents sink water from backflowing into the dishwasher. Many local codes require an air gap rather than a high loop.

Running the Lines

Route the supply line and drain hose through the hole in the cabinet wall, keeping them away from the dishwasher mounting area and any sharp edges that could damage the lines. Use cable clamps or ties to secure the hoses and prevent kinking. The drain hose should have a continuous slope downward from the high point under the counter to the disposal or drain connection — avoid creating any low spots where water can pool and stagnate. Ensure both lines have enough slack to allow the dishwasher to be pulled out for future service without disconnecting.

Testing the Connections

Before pushing the dishwasher fully into position, turn on the water supply and check the supply line connections for leaks. Run a short wash cycle and check the drain connection during the drain phase. Inspect under the sink for any dripping. Verify the air gap or high loop is properly positioned. Once all connections are confirmed leak-free, push the dishwasher into its final position, level it using the adjustable legs, and secure it to the countertop with the mounting brackets. Avoid crushing or kinking the supply or drain lines as you slide the unit into place.