This NADS Brass Stout Faucet is a traditional pub-style faucet used primarily with low carbonated ales or stouts. This is the type of faucet most often used with a nitrogen CO2 mix. Before being dispensed, the beer is forced through a restriction disc that degasses the beer and creates a creamy white head. The brass stout faucet comes with a stainless steel nozzle so you do not impart any off flavors in your beer. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.