These filters are compatible with all Inogen One and Inogen One G2 Oxygen Portable Oxygen Concentrators.
This is a replacement Column Pair (Two metal column sieve beds) for use with all Inogen One G3 Portable Oxygen Concentrators. Columns should be changed as needed -- generally once a year.
In compliance with FDA requlations, DirectHomeMedical requires a prescription for selected items sold on this site including CPAP and BiLevel Machines, CPAP Masks, Humidifiers, Provent Therapy, and Oxygen Concentrators. Prescriptions are NOT required for a wide range of other items including replacement parts such as headgear, tubing, filters, mask parts, machine parts, comfort accessories, and other supplies.