All American Canner Pressure Cooker 21.5Qt

All American pressure Canner/Cookers feature an exclusive, precision machined ""metal-to-metal"" sealing system. Positive action clamping locks align the cover to the base, forming a steam-tight seal. At the same time, this metal-to-metal seal automatically permits venting under unusual pressure conditions providing an extra margin of safety over conventional rubber or composition gasketed cookers.