All American Canner Pressure Cooker 21.5QtAll 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 release Item Category Code: 5700 Product Group Code: 5700H Inactive: No