Blackburn Threaded 25 Gram CO2 Refills 3-Pack – 2018 3 pack of 25g threaded CO2 cartridges. Compatible with our Wayside inflators. Stash one in your seat bag or your back pack. Piece of mind that is much cheaper than a cab ride home!. Posted in Bicycle Accessories, Bicycle Pumps, Cycling, Outdoor Recreation, Sporting Goods