They're incredibly simple, as they act as a valve. To use, screw a CO2 canister on one end, screw the other onto your valve and either turn a knob or just press down on a lever and with a short blast ...
Bicycling on MSN
CO₂ vs electric inflator: After 6 months, I’m not going back
A tiny electric inflator that makes tire pressure easy: fast enough, impressively accurate, and practical for everyday rides and roadside flats.
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