The DeVilbiss® Five Liter Concentrator (with or without OSD) is designed to be reliable, quiet, energy efficient and lightweight.

Manufacturer:  DeVilbiss

The is designed to be reliable and easy to move around due to its lightweight. Additionally, the Millennium is extremely quiet. With 60% fewer parts, this concentrator is simple to service, and requires less maintenance over its lifetime.

Manufacturer:  Respironics