XS Scuba I.P. Test Gauge w/ QD AdapterXS Scuba Intermediate Pressure Test Gauge w QD Adapter. Components: Low Pressure Gauge: Dual read gauge 0 to 300 psi and 0 to 20 bar 2. 75 diameter Accuracy 1. 5% throughout entire scale Stainless steel case Above water use only Push Button Bleeder: Quick and easy pressure relief O ring seal Easy to service STD OPV: Over pressure relief valve set at 175 185 psi Hidden in picture LP Port Attachment: Male 3 8 24 threads Spin into low pressure port O