For sale: Invacare oxygen concentrator 5 liters max 93 to 98% oxygen rate, pre used. And Yuwell 5L heavy duty oxygen concentrator. Both pre used. And could be used for lomg period
Olive Medical Oxygen Concentrator 5 Liters - CPAP Machines and Supplies Philippines
Philips Respironics EverFlo - SleepScienzzz
Oxygen Concentrator Portabe Precision – RMedina / Medical Depot