The regulator is made by Sherman, the brand speaks for itself, it's quality and reliability is well known among welding specialists.
The regulator allows to decrease a pressure of a gas coming from a bottle to desired level. The outer pressure level can be maintained regardless of spikes and falls of input gas pressure. The regulator is equipped with a safety valve, if the pressure excess safe level, it is released outside.
More technical information can be found on the right hand side
Sherman Argon/Co2 gas twin gauge regulator
Input pressure [bar] 185 Output pressure range [bar] 0.5 - 10 Maximum flow rate [m 3 / h] 15 Thread inlet (EU Standard) W21.8 x 1 / 14 Thread gauge G 1/4 Outer thread (ø) [mm] 6.3