Miller Smith 825-0009 Nitrogen Ultra High Pressure Purging Regulator 2 Self relieving adjusting screw - Low torque control adjusting screw permits easy adjustment of pressures in closed or dead end systems. All regulators are 100 percent tested at the maximum rated operating pressure and are cleaned for oxygen service. Nickel plated body, bonnet and gauges protects the regulator from corrosion and extends service life. Bonnet vent hole is tapped (1/16 in) to allow for installation of captured vent to vent away gases away from the work area. Large 2-1/2 in single scale gauges make for easy gauge reading at greater distances from the regulator than conventional 2 in gauges.