what is standard faucet hole size in a sink
Hole Sizing. 1  A standard (non-air-gap) faucet, with or without tubing attached, needs a hole that's 7/16 in diameter or larger. You can install standard faucets comfortably in holes up to 1.25. 2  An air gap faucet needs a hole that's at least 3/4 in diameter, and it should be no larger than 1 1/4.