This is the XS Scuba IP Intermediate Pressure Test Gauge with QD Adapter Features: XS SCUBA Intermediate Pressure Gauge Checker Low Pressure Gauge: Dual scale: 0 to 300 psi and 0 to 20 bar 2.75 in (69.8 mm) diameter Stainless steel case Above water use onlyl read gauge 0 to 300 psi and 0 to 20 bar Gauge Boot: Included with fill checker Snug fitting, silicone compound for protection of gauge Push Button Bleeder: Quick and easy pressure relief; O-ring seal; Easy to service Standard Over Pressure Valve: 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-ring seal Spin-On Adapter: Included with fill-checker Allows fast attachment to standard BC QD hose Quick and accurate check of first stage intermediate pressure. "