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Prestacycle Alloy CO2 Mini Pump - Inflator Head Not Included. Prestacycle Alloy CO2 Mini Pump. This tiny object weighs 33 grams and takes about the same space as a CO2 cartridge. It attaches to a CO2 head to work as a pump when youve run out of CO2. This would be a riders "spare" CO2. Lighter tiny and never runs-out. This saves space and weigh over carrying an entire pump.