The OMS high performance AirStream first stage regulator now comes in a new Compact version. This first stage is made using a CNC machining process and is finshed in PVD! PVD stands for physical vapor deposition, a process used to create the highest durability, most tarnish and corrosion resistance possible today! It is a tower version, environmentally sealed, and has 4 Low Pressure ports and 2 High Pressure ports. Available in DIN and Yoke connections.