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These are two 45 g threaded CO₂ cartridges, the larger size used for inflating tires and powering compact inflation devices. The 45 g size holds more gas than the common 12 g and 16 g cartridges, so one canister fills more or bigger tires before you swap it out. They suit cyclists, motorcyclists and anyone with a threaded CO₂ inflator who wants a spare on hand. Buyers should check that their inflator or device takes the 45 g threaded format, since the smaller sizes are not interchangeable.
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Lowest price we've seen: $19.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Note: Due to shipping restrictions, this product cannot be shipped to Hawaii.
