All American Canner Pressure Cooker 21.5Qt Exclusive metal-to-metal seal, no gaskets to crack, burn, replace or clean;5, 10 and 15 pound pressure regulator weight;Positive action clamping wing nuts permit easy opening and closing;Double thickness edges for additional protection on these points of heaviest wear;Automatic overpressure releasetable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 5700 Product Group Code: 5700H Inactive: No