What Size Is the Hole for the Faucet in the Countertop?

One of the most common questions we get is “What size hole do we cut for the faucet?”

All of the kitchen faucets except the RO/filter faucet need an 1 3/8″ hole – see below. To install the faucet into the hole, you need to remove the black plastic thread protectors on the water lines.