What you need to know before you start
A dishwasher drain hose is the rubber tube that carries dirty water out of the machine and into your sink drain or garbage disposal. When it cracks, splits, or develops a kink, water leaks onto your kitchen floor instead of draining away. Replacing it is a job you can do yourself in about 30 minutes with basic tools—no special plumbing knowledge required.
The hose connects to the dishwasher at one end and to your drain system at the other. Both connections use straightforward clamps or push-fit fittings that you can loosen by hand or with a screwdriver. The hardest part is usually reaching the connection points, not the replacement itself.
Before you begin, turn off the power to the dishwasher at the circuit breaker and shut off the water supply valve underneath the sink. This prevents accidental water spray and electrical hazard while you work.
Key Takeaways
- Turn off power at the breaker and water at the shutoff valve under the sink before you touch anything.
- The drain hose connects to the dishwasher with a clamp or clip on the bottom or side, and to the sink drain with a second clamp or push-fit connector.
- You can buy a replacement hose at any home center for $15 to $40, and it comes in standard sizes that fit most machines.
- Reuse the old clamps if they are not rusted or damaged; new clamps cost $2 to $5 if you need them.
- Test the new hose by running the dishwasher on a short cycle and checking for leaks before you push the machine back into place.
Locate both ends of the hose and gather your tools
Pull the dishwasher out from under the counter far enough that you can see the back. You will see the drain hose—a ribbed rubber tube, usually gray or black—running from the bottom of the machine toward the wall or sink cabinet. Follow it to where it connects to the dishwasher itself, then trace it to where it enters your drain system (either the sink tailpiece, the garbage disposal, or a standpipe).
Gather a flathead screwdriver, a Phillips screwdriver, a bucket or towel to catch residual water, and your replacement hose. Measure the diameter of the old hose (usually 5/8 inch or 3/4 inch) so you buy the correct size. Most hardware stores stock universal replacement hoses that fit either size.
Place the bucket under the hose connection points. Even though you shut off the water, standing water inside the hose will spill when you disconnect it.
Disconnect the hose from the dishwasher
Look at the point where the hose attaches to the dishwasher pump outlet. You will see either a stainless steel hose clamp (a band with a screw) or a plastic clip. If it is a clamp, use the screwdriver to loosen the screw by turning it counterclockwise—you do not need to remove it completely, just loosen it enough that the clamp slides off the hose barb. If it is a plastic clip, squeeze or pry it open with the screwdriver tip until the hose slides free.
Gently twist and pull the hose away from the dishwasher outlet. If it is stuck, do not force it; instead, use a utility knife to score the inside of the hose where it grips the barb, then try again. Once it is free, let any remaining water drain into your bucket.
Disconnect the hose from the drain system
Follow the hose to the other end, where it connects to your sink drain, garbage disposal, or standpipe. This connection also uses either a clamp or a push-fit fitting. If it is a clamp, loosen the screw the same way you did at the dishwasher end. If it is a push-fit connector (a plastic collar that slides over the hose), twist it counterclockwise to unscrew it, or straightforward pull the hose straight out if there is no collar.
Let the hose drain fully into your bucket. If water is still dripping from the drain opening, place a rag underneath to catch it. Once the hose is free, set it aside—you can discard it or keep it as a spare.
Install the new hose and find both connections
Take your new hose and push it firmly onto the dishwasher pump outlet until it seats fully. The hose should slide on smoothly; if it is too tight, run warm water over the end of the hose for a few seconds to soften the rubber. Once it is on, slide the clamp (or clip) over the connection and tighten the screw until it is snug—firm enough that the hose does not twist, but not so tight that you crush the barb.
Now connect the other end of the hose to your drain system. If you are connecting to a sink tailpiece or garbage disposal, push the hose on and find it with the clamp the same way. If you are connecting to a standpipe (a vertical drain stub), you may need a drain adapter fitting; ask the hardware store staff to show you the correct one for your setup. Tighten the clamp or collar until it is snug.
Make sure the hose does not have any sharp kinks or bends. A gentle curve is fine, but a tight fold will restrict water flow and cause the dishwasher to back up. If the hose is too long, coil the excess loosely behind the machine rather than cutting it.
Test the new hose before pushing the dishwasher back
Turn the water supply back on at the shutoff valve under the sink. Turn the power back on at the circuit breaker. Run the dishwasher on a short cycle (rinse only, if your model has that option) and watch the drain connections from underneath. You should see water flowing smoothly out of the hose with no drips or sprays at either clamp.
If you see a leak at a clamp, turn off the power and water again, and tighten the clamp screw a quarter turn. Retest. If water is leaking from inside the hose itself (not at a connection), the hose may be cracked; you will need to replace it again. If everything is dry, let the cycle finish and then push the dishwasher back into its opening.
When to call a plumber
If the drain hose connection at the sink or garbage disposal is corroded or broken, or if you cannot locate where the hose connects to your drain system, stop and call a plumber. The same applies if water backs up into the dishwasher even after you install a new hose—that usually means the drain line itself is blocked, which requires professional clearing.
If you are not comfortable working under the sink or if your dishwasher is built into cabinetry in a way that makes it hard to access, a plumber can do this job in under an hour for a service call plus the cost of the hose.
Frequently Asked Questions
Can I use a garden hose or vinyl tubing instead of a dishwasher drain hose?
No. Dishwasher drain hoses are made of reinforced rubber designed to withstand hot water and repeated flexing. Garden hose and vinyl tubing will crack or melt under the heat and pressure. Always use a hose labeled for dishwasher use.
What size drain hose do I need?
Most dishwashers use either 5/8-inch or 3/4-inch hose. Check your owner's manual or measure the diameter of the old hose. Universal replacement hoses come with adapters for both sizes, so you can buy one and use the fitting that matches your machine.
How long does a dishwasher drain hose usually last?
A drain hose typically lasts 5 to 10 years depending on water temperature, how often the dishwasher runs, and whether the hose has been kinked or pinched. If yours is leaking or cracked, replace it rather than patching it—a patch will fail within weeks.
Do I need to use new clamps, or can I reuse the old ones?
Reuse the old clamps if they are not rusted, stripped, or damaged. If the screw spins without tightening or the clamp is corroded, buy new stainless steel hose clamps at the hardware store for $2 to $5 each.
What if water leaks from the connection even after I tighten the clamp?
First, make sure the hose is pushed all the way onto the barb—it should go on until it stops. If it is fully seated and still leaks, the barb may be cracked or the hose may be the wrong size. Try a new hose or, if the barb is damaged, call a plumber to assess whether the dishwasher pump needs repair.