We came out today to see why the customers dishwasher wasn’t draining since he had his neighbor install the garbage disposal. We remove the knockout plug and turn the drain on for the dishwasher and everything was fine, also looped the dishwasher drain high as the airgap the line properly and Clamped the flange Just a little bit more just secure it better this all took us a total of five minutes so we charged accordingly and customer paid with a card on file also giving the technician a $10 tip. No follow up at this time.