Works on gas, electric, smooth-top, and induction ranges. Constructed of heavy-gauge polished aluminum with a stainless steel-clad base for fast, even heating. Air vent/cover lock allows pressure to build up only when the cover is closed properly and prevents the cover from opening until pressure is safely reduced. Doubles as water bath canners for preserving fruits, jams, jellies, pickles and salsas. Mason Jar Capacity: 26 Half-Pints, 20 Pints, 7 Quarts. 23-Quart liquid capacity (21.8 liters). The easy-to-read gauge automatically registers a complete range of processing pressures. Cooking/canning rack and instruction/recipe book included.