Step 5 · Connect Air Gap to Garbage Disposal
Locate the drain inlet nipple on the side of the garbage disposal. If it has never been used, there will be a plastic plug inside that needs to be removed. Insert a screwdriver or a punch into the inlet and tap it firmly with a hammer to knock the plug out. Reach into the disposal (power is off!) and retrieve the plastic plug. Now, take your new, larger diameter drain hose (typically 7/8-inch) and connect one end to the larger outlet nipple on the bottom of the air gap. Secure it with a hose clamp. Route the other end of this new hose to the garbage disposal's inlet nipple. Secure it with the second hose clamp. Tighten both clamps firmly with a screwdriver.