Two removable columns (metal tubes) on the OxyGo Portable Oxygen Concentrator for 5 setting OxyGo convert normal air into a high concentration of oxygen. There is one located on each side of the device. Sieves can be removed by pressing the latch button with your thumb. Since these columns will endure normal wear and tear with extended use, it is recommended that the pair are replaced every 18 month to 2 years. However the unit may notify you earlier that it is necessary to replace these columns sooner due to operating conditions.
Sold as a pair.
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