GENTEC R21B Series is a Diaphram-Sensed Single Stage High Purity Nickle Plated Brass Regulator designed for use with analytical applications using non-corrosive gases. Features and Specification: Body/Bonnet: Nickle-Plated Brass Barstock Seat: PCTFE 316L Stainless Steel Diaphragm ABS adjusting Knob 2in Dual-Scale Pressure Gauges Maximum inlet pressure: 3000 psig Maximum outlet pressure: 500psig Operating temperature range:40 degrees farenheit -165 degrees farenheit – 40 to 74 degrees celsius Inboard Leakage 2 x 10-8 atm.cc/sec He Outboard Leakage 2 x 10-8 atm.cc/sec He Weight:2.2 lbApplications: Research Laboratories Process Analyzer Petrochemical Industry Gas Chromatography Power Plants Semiconductor Industry