A pressure cooker needs to be able to reach 5, 10 and 15 pounds of pressure, depending on what you are canning and your elevation.
It also must be able to hold at least 3 quart jars of food. This requirement has to do with timing of recipes. Tested recipes count the time it takes to heat the food in the canner and bring the pressure up. Smaller jars, less time, recipe may not work safely.
I just haven't been the same
since that house fell on my sister.