In my home, there was a beautiful granite countertop, still in terrific shape on the kitchen island. The thought of putting a hole in it made me more than a bit uncomfortable. However, my wife, Lynn, wanted me to do exactly that. She reasoned that because the oven, the cook top, the microwave, the dishwasher, and the sink were all clustered in one corner of the kitchen, it always became quite crowded in that part of the room. If there was a prep sink on the far end of the island, it would help to solve this problem.
Click here for more information on the air admittance valve used in this project.