Step 4 · Connect Dishwasher Hose to Air Gap
Locate the dishwasher's drain hose under the sink. It's the flexible, ribbed hose coming from the dishwasher. Identify the smaller of the two plastic nipples on the bottom of the air gap you just installed (usually 5/8-inch diameter). Route the dishwasher drain hose up from the dishwasher to this smaller inlet. If the hose is too long, trim it with a utility knife to avoid kinks. Slide a hose clamp over the end of the hose, push the hose firmly onto the air gap's inlet nipple, and position the clamp about 1/4 inch from the end of the hose. Use a screwdriver or nut driver to tighten the clamp securely.