This is the small oxygen regulator that fits the disposable oxygen bottles. No gauges, just a knob on top that adjusts pressure.,Features:,,,1/4" Barb Output,,,Max Delivery Pressure: 100 PSI,,,Max Flow Rate:  180 CFH,,,Regulator is Left Hand Thread,,,Stainless Steel Actuating Rod,,,Machined brass body with adjusting cap, piston and hose connection,