Installing a water line and drain pipe for an under the counter dishwasher is the same for a new dishwasher as it is for an old one. Once the location is chosen and the electrical works are connected, before the electricity is turned back on, install the water line and drain pipe for the dishwasher. Proper placement of water tubes and drain pipes will insure the dishwasher works correctly.
Be sure to have everything you need before starting to install the water line. The items needed are, a shutoff valve, the water line, a tape measure, a hand saw, a piece of copper tubing, a drain tube, a T-fitting, an adjustable wrench, and 4 compression fittings.
Before starting any work on the water line, be sure to shut off the water and empty the hot water line. Put a container under the hot water line and cut the line to install the T-fitting.
Place a compression fitting on each end. Tighten the fittings by hand, and then just a quarter turn with the adjustable wrench.
Attach the shutoff valve to the T-fitting. Secure the water line from the dishwasher to the shutoff valve.
Keep the container under the hot-water supply line. Turn the water back on. Look for leaks in all connections. Carefully tighten the connections a quarter turn at a time, if there is a leak. Once there are no leaks, time to move on to the drain hose.
Install the drain hose by measuring and cutting the drain tube to fit from the dishwasher to the drain. If attaching the drain hose through a garbage disposal, there will be space in the disposal to install a dishwasher drain pipe. If there is not a disposal, a waste T-fitting will need to be installed to attach to the drain.
Be sure to secure all connections before testing. Turn on the water and test again for leaks. If leaks are present, tighten the connections a little more, being careful not to over tighten. One quarter turn at a time, until the leak is stopped. Copper is a soft metal and will bend or break easily.
Once all connections are not leaking, finish installation of the dishwasher and run a test cycle. Check once again for any leaks. Once no leaks are found, installation is successful and finished. Place the dishwasher securely in its place.
If you have one, always refer to the installation manual for manufacturer specific installation.
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