Norgren® by Dixon® Relieving General Purpose Jumbo Regulator with GC230 Gauge, series: 1 Series R18, 2 in PTF, 2000 scfm Flow Rate, 5 to 125 psi Pressure. Norgren® by Dixon® R18-C05RG 1 Series Relieving General Purpose Jumbo Regulator with GC230 Gauge, 2 in PTF, 2000 scfm