The 17 CO2 Unthreaded 16g Gas Cartridge is a manual handheld gas cartridge designed for use with beer kegs. Made of steel with a diameter of 21.9mm and a length of less than 5 inches, this silver-coloured cartridge is compatible with various kegerators and offers features such as easy cleaning and compatibility with different brands like Klarstein and Salter EK4919. With a power source of manual operation and a unit quantity of 16g, this gas cartridge is an ideal choice for those looking to fill their own beer kegs with carbon dioxide gas for a refreshing home brew experience. These are new old stock - see photos for condition.