Built upon a legacy of reliable, field-proven concentrator models, the DeVilbiss 5 Liter Oxygen Concentrator was updated with enhanced quality, durability, performance and simplicity in mind. Made in the USA, this robust oxygen concentrator offers just the right balance of cool and quiet. The simplified, two-piece cabinet design allows for 15% typical sound quality improvement and an improved cooling process. Paired with proven, exclusive DeVilbiss Turn-Down Technology, these improvements minimize wear on internal components and increase the life expectancy of the unit. The concentrator is easy to assemble and disassemble, and it requires no maintenance for two years.