Back Pressure Compensated Flow-meter, Adjustment of the flow by needle valve with micro metrical regulation. Internal filter included. Standard flow 0-15 lpm of Oxygen. Poly carbonate, autoclavable humidifier bottle. Inlet thread: 38" BSP(F)Can be used for Mox Oxygen Regulator andor for Wall Oxygen outlet of Medical Gas Pipeline(MGPS) with use of compatible adapter specified for your wall outlet.