Humidifier Bottle for use with Oxygen Sources such as Concentrators Liquid and Gas. * Drive?s multi-threaded lid ensures a secure fit every-time preventing leaks and service calls. * Compatible with oxygen flow up to 15 LPM. * Audible back pressure alarm activates at 6 psi. * No aluminum fitting in stem: it eliminates shredded aluminum diffuser so often found in lower quality models. * Soft plastic diffuser reduces clogging due to mineral build-up. * Translucent jar provides improved visibility of jar contents. * Humidifier bottle lid is colored green/yellow making it easy to tell patients on the phone how to change the bottle. * Bottle has a 500 ml water capacity. * Bottle fill line is very easy to see. * There are finger grips at the top of the bottle making the lid easier to screw on/off for the patient.