What is the minimum air gap required for a gooseneck faucet?

The minimum air gap required for a gooseneck faucet is crucial in preventing backflow contamination. An air gap is a physical separation between the water supply outlet and the flood level of a fixture to prevent any potential backflow from contaminating the drinking water supply. For a gooseneck faucet specifically, the standard minimum requirement is 1.5 inches. This distance is sufficient to ensure that any potential contaminants do not siphon back into the potable water supply.

Choosing a minimum air gap ensures that even under negative pressure conditions, the water is kept safe from spilling back into the system. While there are varying requirements based on the type of fixture and local codes, for gooseneck faucets, a 1.5-inch air gap is the established standard that balances safety with functionality. This is why selecting this value demonstrates an understanding of plumbing safety standards.