Refill service for the Mammut 300 Bar / 4350 psi carbon cartridge filled with Nitrogen for use with Mammut and Snowpulse 2.0 (winter 11/12 onwards) and 3.0 (winter 16/17 onwards) avalanche air bags. This product costs £15 for the refill and £126.00 deposit. When you buy a refill we will send you a full Mammut Carbon Cartridge. When we receive your empty carbon cartridge, the deposit element will be refunded back to you. The refill is actually free, the price just covers postage costs of a restricted item. This refill service is only for cartridges compatible with the Mammut 2.0 or 3.0 systems, it is not for use with cartridges of the original snowpulse system (pre winter 2011) or any packs which use a non-Mammut system. Mammut Carbon Cartridge Refill