The two-stage COAX® cartridge MIDI has small mounting dimensions and the three-stage COAX® cartridge MIDI has high initial vacuum flow. The MIDI cartridges are efficient generators of blow-air and are also suitable for fast evacuation of large volumes. The Pi cartridge is recommended for non-leaking applications, or if the feed pressure fluctuates due to pressure drops, in order to secure high reliability of the vacuum system. It is also used in specific blowing applications. The Si cartridges are recommended for leaking applications and have large vacuum flow in relation to energy consumption. The Xi cartridges are recommended for sealed applications and when deep vacuum is needed. This is the right choice when vacuum levels higher than 75 –kPa are needed.