Inogen One G4 Replacement Column Pair - Oxygen Accessories - Two Removable Metal Columns - 0.63 lb., 2.21 in. W x 2.37 in. L x 5.50 in. H

Function well, good price.

Fits my G4 perfectly very easy to install delivered the next day

Worked perfect. An exact match for the factory column. Followed the directions and no problems.Will buy again when needed.

Good replacement for my oxigen concentrator.

Received it next day. New scrubber for 100 dollars. 2 minutes to remove old scrubber and slide new scrubber in. Working properly. Don't know how long it will last. I use it everyday and will update performance of product.

Inogen packaging appeared open. Item appears not used. Only the life of the Column will tell. All else is A ok.

These columns work great

Saved myself lots of $$$ by replacing columns myself.The directions sent with the columns were easy to follow.