Invacare ® PerfecTo 2™ v oxygen concenTraTor The Invacare® Perfecto2™ V oxygen concentrator is an economical addition to the premier Invacare stationary concentrator line. This 5-liter concentrator is small, quiet and lightweight and comes standard with the Invacare® Senso2® oxygen Sensor. The Perfecto2 V unit incorporates many of the best features of the ….