Prepare a spare and you can rest assured! AI net regulator sealing flat type (1 piece); AI net compatible product; CO2 full set smart (models up to circa 2010); 2-way regulator (for small and large cylinders). Features: This is a replacement gasket for AI net CO2 regulator. O-rings are consumables. Repeated replacement of the CO2 cylinder will damage the O-ring connecting to the regulator and cylinder, eliminating the seal and releasing the gas. It is very convenient to have one spare as it requires regular replacement. Please check your regulator before purchasing. Quantity: 1 piece