Use this regulator to dispense Nitrogen, Argon or beer gas mix (70/30 nitrogen/CO2) used for Guinness and some other draft beers. Has a higher high pressure gauge that a CO2 regulator since Nitrogen is filled as a gas instead of a liquid. The starting pressure in a Nitrogen tank will be about 2200 p.s.i. as opposed to 800 p.s.i for a CO2 tank. This is a CGA 580 regulator. 5/16" barb. Manufactured by USA company Taprite.