Our pressure cooker is made with super aluminum alloy containing automatic safety device for opening and closing.Its working pressure is 80Kpa and it has Multiple safety deices:spring valve,alarm valve, pressure limit valve.Safety outlet in cover can release steam in case of excessive pressure build-up. This item has following models Model APC-20K APC-22K APC-24K APC-26K Wattage 20CM 22CM 24CM 26CM Capacity4L 5L 7L 9L