How to Replace Kitchen Sink Dishwasher Drain Pipe

Search below the kitchen sink to find the dishwasher's water supply line; this line often connects to a three-way supply valve. Follow the supply line to the supply valve and turn the valve's handle clockwise to shut off the water supply to the dishwasher.

Remove the dishwasher's power supply cord from the under-sink receptacle. Alternatively, move to the kitchen's circuit breaker panel and flip the dishwasher's breaker to the off position.

Set a bucket below the dishwasher drain hose's connection to the sink's air gap. If your hose connects to the air gap with a band clamp, insert a screwdriver into the clamp's screw or place a nut driver over the screw's hexagonal head. Turn screwdriver or nut driver counterclockwise to loosen the screw and clamp.

Slide the clamp away from the air gap's inlet. If your hose connects to the air gap with a spring clamp, pinch the clamp's tabs and slide it away from the air gap.

Shimmy and pull the hose from the air gap's inlet. Set the hose's loose end in the bucket. Allow excess water to drain into the bucket.

Attach an adjustable wrench to the nut that connects the supply line to the supply valve. Twist the supply line's nut counterclockwise. Loosen and remove the supply line from the valve's outlet. Set the loose end of the supply line in the bucket. Allow excess water to drain into the bucket.

Unlock the dishwasher's wheels by pressing or pushing or the levers attached to the sides of the wheels. Pull the dishwasher away from the wall.

Loosen and remove the dishwasher drain hose's band or spring clamp from the appliances drain outlet. Place the loose end of the hose in the bucket and allow excess water to drain. Wipe any spilled water with rags.

Stretch out the old drain hose beside a length of replacement hose. Mark the length of the old hose on the new hose with a pencil or marker. Cut the replacement hose to size with heavy-duty scissors.

Remove the clamps from the old hose. Place the clamps on the new hose. Insert one end of the new hose over the dishwasher's drain outlet. Slide a clamp over the portion of the hose that covers the outlet. Tighten the clamp with a screwdriver or nut driver.

Push the dishwasher into its original position. Slip the loose end of the new drain hose over the air gap's inlet. Slide a clamp over the portion of the hose that covers the inlet and tighten the clamp with a screwdriver or nut driver.

Reattach the removed water supply line. Turn on the water supply. Plug in the dishwasher's power cord or activate its breaker. Run the appliance through a cycle and check for leaks.