Replacing the dual sink with a large sink with likely a centered drain and having to remove the existing garbage disposal as a result. The dishwasher currently drains into the disposal without an air gap (not to code). Replacing and reconnecting the sink drain seems easy enough but wondering what would be the right, to code, way to handle the dishwasher drain? do I need create some venting, or add an airgap? Our city is located in IL and uses the 2022 International Residential Building Code.
This is actually simple.
You need a Dishwasher wye tailpiece.
Sink drain tailpiece to DW wye to 1 1/2" min P-trap.
You may have to get a DW drain extension hose to make the riser loop up to the underside of the sink.