All American 21.5 QT Pressure Cooker/Canner - 921 Product Features Only 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. Since the seal does not use a gasket, the cover can be easily opened and closed. ALL-AMERICAN Pressure Canner/Cookers make it easy to can fish, meat, vegetables and fruits - it's the only method the USDA recommends for low-acid foods. All models feature a readable pressure guage for accurate pressure control and an easy-to-read, 8.5 x 11" Instruction and Recipe Book.