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.