I am planning to install a new kitchen sink. The present sink has an air vent installed in the "fourth" hole (Chrome plastic vent). I want to install a sprayer in that hole. The dish washer and disposal are connected under the sink into the vent valve by a y connector. If I used that hole for the sprayer, how do I handle the washer / disposal vents? I have search the forum and see many references to the air vent but not how to "replace" it or "move" it. Thanks