Why does equipment maintenance matter?
Safe canning depends on reaching and holding conditions that destroy dangerous organisms. That requires equipment that works as intended: a canner that seals, vents that are clear, gauges that read correctly and racks that hold jars off the bottom.
A small defect you do not notice can undermine a process you followed perfectly. Maintenance is part of the recipe. Many canning problems blamed on recipes come from equipment. A jar that fails to seal, a canner that vents slowly or a gauge that reads oddly can all be traced to a part that needed care. Making an equipment check part of your season start saves wasted food and wasted effort, and it protects the people who will eat the results.
What should you check before each season?
Take everything out and look it over in good light. Check pots for warping, dents or rust. Check racks and tools for damage. Look at jar lifters, funnels and lid wands. Replace anything cracked, bent or worn.
Read the manual that came with your canner. If you no longer have it, ask the maker for a copy or an updated one.
- Look over pots, racks and tools for damage
- Inspect the sealing ring or gasket for cracks or stiffness
- Check that vents and openings are clear
- Have the gauge tested if it is a dial type
How do you care for a pressure canner?
Wash the lid and body by hand according to the maker's directions, and do not immerse parts the manual says should stay dry, such as some dial gauges. Make sure the vent pipe is open by holding it up to light. Check the safety valve and any overpressure plug as the manual describes.
Check the gasket on canners that have one. A gasket that is cracked, stiff, sticky or stretched should be replaced with the part the maker specifies. Do not use improvised substitutes. Keep the manual for each piece of equipment together in a folder. Makers update instructions and part numbers, and a current manual lists the replacement parts that fit your canner. If you buy a canner secondhand, ask the maker whether parts are still available before you rely on it.
How should you handle the gauge?
A dial gauge can lose accuracy over time or after a knock, and an inaccurate gauge can leave food underprocessed without any visible sign. Many extension offices offer gauge testing, so ask yours how it works and how often they suggest it. Weighted gauges have their own care instructions in the manual.
Treat the gauge gently, and do not use a gauge that was dropped or that shows any sign of damage until it has been checked. Keep a basic kit of spare parts that your maker recommends, such as gaskets and vent parts, so that a worn piece does not stop a canning day. Ask your extension office which items are worth keeping in stock and which are better ordered when needed, because some parts age on the shelf.
How do you clean and dry things?
Wash canning pots, racks and tools after each use and dry them fully to stop rust and mineral buildup. If you have hard water, ask your extension office how to deal with deposits. Do not use abrasive pads that scratch the metal in a way the maker warns against.
Wash and dry removable parts, then reassemble loosely so that moisture can escape.
How should you store equipment?
Store in a clean, dry place. Many makers advise leaving the lid inverted or placed loosely on the pot so air circulates and odors do not build up. Keep the gasket as the maker recommends and out of direct heat and sunlight.
Keep manuals, receipts and notes about gauge testing in a labeled folder so you can find them next season. Do a dry run at the start of the season. Assemble the canner, check that the lid closes properly and that steam vents as the manual describes, using water only. A dry run shows problems when nothing is at stake, and it refreshes your memory on the steps.
When should you replace or retire equipment?
Retire a canner that is warped, badly dented, has a damaged sealing surface, or that cannot be fitted with replacement parts from the maker. Be careful with old secondhand canners, since parts and manuals may be missing. Ask your extension office and the manufacturer before you buy or use one.
Key takeaways
- Inspect pots, racks, gaskets and vents before every season.
- Have dial gauges tested through your extension office.
- Clean, dry and store equipment as the manual directs.
- Use only maker-approved replacement parts, and retire damaged canners.
Sources and further reading
Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.