Note: these machines make their own oxygen. Oxygen tanks are not required. Only the rear air filter needs to be cleaned once in a while. Simply plug it in, turn it on and in 5 min the unit produces 93% oxygen for years and years!
AirSep New Life Intensity Oxygen generator 10 LPM NEW
AirSep Onyx oxygen generator 6 LPM NEW
AirSep Onyx Plus oxygen generator 8 LPM NEW
Invacare Perfecto2 Oxygen Concentrator 5LPM REFURBISHED
Respironics EverFlo Oxygen Concentrator 5LPM Refurbished