One reusable silicone faucet knockout that will create a 1-3/8" hole which will work with most standard faucets. It will also create a 2-1/2" pocket that is 1" beneath the surface to fasten hardware in. This will accept most faucets and spouts. Must be used with 1/2" substrate and our standard 2-1/4" forms.

WARNING: some of the newer faucets require larger than 1-3/8" hole. Please check your facucet. If you need a larger hole, you can wrap the top of the knockout in electrical tape to increase the diameter.