Airgas Model C444B590 Supelcoat™ Coated Stainless Steel High Purity/Corrosive Service Cyclone Technology Single Stage Pressure Regulator With 1/4" FNPT ConnectionAirgas unique line of Cyclone Technology pressure regulators are designed to preserve the specific gas mixture. These have a unique internal design to ensure all surfaces are continually swept, thus not allowing any dropout regardless of differences in specific weight of the various compounds within the mixture. These regulators also have a proprietary Supelcoat coating that prevent interaction of corrosive and volatile compounds in high purity gas