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The Inogen One G4 is no longer available for new purchase and has been permanently replaced by the next-generation Inogen Rove 4 Portable Oxygen Concentrator
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This is the internal inlet filter — accessed by removing the battery
which many lighter units do not offer
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Inogen One G3 Column Filters (Pair) CPAP The Inogen One G4 isThe removable sieve columns for the Inogen One G3 contain the sieve filters that separate inert gases from room air and concentrate it into medical grade oxygen. Keep a pair on hand so you can replace them on schedule and keep your G3 producing the correct oxygen concentration. Compatibility Designed specifically for the Inogen One G3 portable oxygen concentrator. Not interchangeable with G4, G5, At Home, or other Inogen models. What's in this pack? 2