The Mammut Cartridge Refillable 207 Bar Alu (Empty) is an essential component of the avalanche airbag system and must be ordered separately. This cartridge is completely compatible with the Removable Airbag System R.A.S. and the Protection Airbag System, as well as with Snowpulse avalanche airbags from the 2011-12 season. It is intended for sale in the USA and Canada and can be refilled by the user after any deployment using a compressor or diving cylinder. The filling pressure of the cartridge can be checked quickly and safely using a pressure gauge. The cartridge refill kit and a compressed air source are required for refilling.