The Inogen At Home Column Pair (#RP-402) includes two replacement columns.
Warranty: 1 Year.
Sold and used as a pair, each Inogen At Home Replacement Column Pair makes it quick and easy for you to service your Inogen At Home Oxygen Concentrator without having to send it in for repair. The columns contain the sieve beds that convert normal air to medical grade oxygen, unfortunately the sieve beds wear down after prolonged use and need to be replaced. It is recommended that you replace the columns every 18 months to two years, but in certain conditions earlier replacement may be required. No tools are necessary to switch out the column pair.
Inogen At Home Oxygen Concentrator User Manual
Inogen At Home Oxygen Concentrator Multi-Lingual User Manual