This water dispensing faucet has 5/8-18 UNF male thread with 3/8" ID Barb. Tomlinson's HFS faucets for gravity water dispensers are ideal for use on small bucket-like containers. These NSF listed faucets, manufactured of FDA-grade materials, feature a lock open handle that provides a regulated flow of 3.21 oz/sec(1.51 gal/min).