Not all plumbing fixtures are designed for 2"+ thick concrete countertops, but this knockout will create a void for the faucet while providing a recess on the back side of the countertop for the faucet set nut, making for easy installation of faucet fixtures, control valves, and dishwasher vents.
These durable polyurethane rubber Faucet Forms will cast a 1-1/2" diameter void and come in two thicknesses (2" and 2-1/2"). They are re-usable for multiple concrete castings. Installation hardware and instructions are included.
For more tips on installing and removing Faucet Forms, refer to pages 68 and 133 of the Concrete Countertops Book and download the instructions in PDF form.