What is this product used for?A.
The Blanco 440035 Air gap provides for backflow prevention. It is installed above the counter top and attached to the waterline to prevent drain water from the sink from backing up into the dishwasher.
What are the installation dimensions, e.g. hole size, max countertop thickness?A. The Blanco 440035's hole size is 1.38". This can be installed into a maximum countertop thickness of 7/8".