HomeFill Ambulatory Package M9 cylindersThe M9 cylinders included with this ambulatory package take about 125 minutes to refill while you continue to use the concentrator. Ambulatory Package includes: IOH200 HomeFill Compressor (2) HF2PC9 HomeFill Patient Convenience Pack (M9 size with integrated conservers) (1) HF2PC9BAG carrying bag (1) IOH270 Ready-Rack for Perfecto2 Package does not include concentrator. The Invacare HomeFill Oxygen System provides ambulatory oxygen by allowing patients to fill their own high-pressure cylinders from an oxygen concentrator. This HomeFill is a multi-stage pump that simply and safely compresses oxygen from a specially equipped Invacare 5-liter or 10-liter concentrator into oxygen cylinders in size M2, ML4, ML6 and M9 .