I installed a new dishwasher in which the dishwasher drain hose connects to an air gap branch tee. The second air gap branch then connects to the PVC Tee on the sink drain tail pipe. The tee on the sink drain is 1/2-inch diameter. The problem is that when the dishwasher pumps discharge water from the unit, water comes out of the air gap assembly spilling onto the sink and counter top. There is no clog in any of the hoses and air gap assembly, as I made sure of this by inspection and removal of the hoses, air gap and dishwasher hose. Is there an issue with size of the tee on the sink tail piece? Thanks for any help you may provide.