Topeak Tubi Master + CO2 Repair Kit – 16g. Topeak Tubi Master + a compact all-in-one tubeless tire repair kit and CO2 inflator makes quick work of repairing flats on the road or trail. CO2 inflator head fits Presta & Schrader valves and carries a single threaded 16g or 25g CO2 cartridge. Tire reamer serrated knife and plug insertion tools fold away into tool body while a special concealed compartment holds repair plugs. A mounting module lets Tubi Master Plus attach to seatposts or bike frame with included velcro strap.