Hooking up the drain is usually pretty easy as part of the overallinstallation of a dishwasher.

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Connect the end of this hose to the air gap using a hose clamp.

Drain hoses connected to back of dishwasher machine

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Warning

When making the connections, ensure the 7/8-inch hose does not have any kinks.

Kinks will restrict the flow of drain water and may cause a blockage over time.

If it is too long, it may need to be trimmed down to size to prevent kinking.

Materials and tools for dishwasher drain hose connections

The Spruce / Kevin Norris

You may need to use some force to slide the hose onto the air gap fitting.

If your drain doesn’t already have this tailpiece,you’ll need to install one.

Secure With Hose Clamps

Use hose clamps to connect both ends of the hose to their tailpieces.

Dishwasher drain hose connected to air gap from under countertop

The Spruce / Kevin Norris

Before you clamp the hose in place, confirm there are no kinks in the tubing.

Too-long hoses can be trimmed down to size.

In some areas, the high-loop method may not be permitted.

Rubber hose from air gap connected to garbage disposal

The Spruce / Kevin Norris

Prepare the Drain Hose

Pull as much of the drain hose as possible from behind the dishwasher.

This high loop will help prevent wastewater from siphoning back into the dishwasher from the garbage disposal.

Connect the Hose

Connect the dishwasher drain tube directly to the garbage disposal with hose clamps.

Dishwasher drain hose connected to air gap under sink

The Spruce / Kevin Norris

To make the transition from the hose to the garbage disposal, you may need a dishwasher connector fitting.

If it’s dirty or clogged, that can also cause draining issues.

This will prevent wastewater from the sink drain from siphoning back into the dishwasher.

Larger air gap hose connected to sink drain hose

The Spruce / Kevin Norris

Y-branch tailpieces that match the size of your dishwasher drain hose can be purchased.

Metal clamps tightened with screwdriver to drain hoses

The Spruce / Kevin Norris

Drain hose pulled from behind dishwasher

The Spruce / Kevin Norris

Drain hose secured below countertop in a high loop

The Spruce / Kevin Norris

Drain hose connected to garbage disposal

The Spruce / Kevin Norris

Dishwasher drain hose pulled under kitchen counter

The Spruce / Kevin Norris

Dishwasher drain hose connected to Y-branch tailpiece under sink

The Spruce / Kevin Norris