That temperature will kill all growing organisms, spores, and viruses. Those foods can be home canned safely using large home pressure cookers. Refer to the manual that came with the cooker for safe canning. First, read and follow all safety instructions in the manual that came with your pressure cooker. I have never had any problems with using home cookers except for routine maintainence such as replacing valves and seals.
Spare parts are available at most hardware stores.
I have often purchased old non-working pressure cookers and installed new seals and parts for some savings of money. However, rubber seals for old off-brand cookers may not be available. You should be able to get parts for Presto and Mirro cookers. Most homes use four quart cookers, but the six quart sizes are will hold larger culture tubes. Pipets are too long to fit into any of them.