View Dishwasher Drain Hose Extension Lowes Gif. An air gap fitting is a safety device mounted on your sink or countertop, through which the dishwasher hose passes on its way to the drain. You will simply extend the line using a barb coupling and clamps at the black end and connect the other end to disposer as normal.
Alternatively you could replace the drain hose with an extra long universal washing machine & dishwasher drain hose extension kit.
If the dishwasher doesn't drain, then the drain hose is blocked. Drainage hose kit (part number 663105) extends the dishwasher supply and drain hose to a maximum length of 6 ft. If your dishwasher isn't draining water, you might have a clog on your hands. I took a portable dishwasher in my cottage and connected the drain hose that normally connects up to the faucet in the kitchen the extension will be 7/8 id.