For low-acid foods such as vegetables, meats and fish. No matter how high you turn up the heat, boiling water cannot surpass 212 degrees F (even lower at high altitudes). Bottoms are even thicker and machined for perfect surface-to-surface heat transfer. All cast aluminum for generations of use. Simple and safe to use so there is no need for close supervision since pressure cannot exceed setting (5, 10 or 15 lbs).
Over-pressure plug acts as back-up. Stay-cool bakelite handles, easy-to-read pressure gauge and detailed owner's manual with recipes and canning hints.