Best Pressure Canner Replacement Gaskets and Parts (2026 Picks)

PreservePath is reader-supported. When you buy through links on our site, we may earn an affiliate commission — at no extra cost to you.

Nothing ends a canning day faster than a canner that will not hold pressure, and the most common cause is also the cheapest to fix: a worn gasket, a tired overpressure plug, or a gauge that no longer reads true. These are wear parts. Gaskets dry out, stretch, and take a permanent set; rubber plugs harden with age and heat; dial gauges drift out of calibration. Replacing them on schedule is routine maintenance, not a repair, and it costs far less than a ruined batch or a replacement canner. This guide explains which part does what, how to tell when each one needs replacing, and how to match the right replacement to your canner, with picks for the major brands.

The short answer

Buy the gasket made for your exact canner make and model, not a "universal" gasket that looks close; replace the gasket when it is stiff, cracked, stretched, nicked, or will not seal even when clean and correctly seated; replace rubber overpressure plugs every few years or at the first sign of hardening or cracking; and have a dial gauge tested for accuracy every season, replacing it if it reads off. Weighted-gauge canners do not need gauge testing, but their gaskets and plugs wear just the same. Always check your canner manual for the correct part numbers, and never run a canner with a damaged gasket, a missing plug, or a gauge you know is inaccurate.

What each part does

The gasket

The gasket is the rubber ring that seals the lid to the pot. When it is in good condition, it flexes to fill the gap between lid and pot and holds steam in so the canner can build and maintain pressure. When it hardens, stretches, or cracks, steam escapes around the lid, the canner struggles to reach pressure or will not hold it, and processing becomes unreliable. A gasket that looks fine but is several seasons old and has gone stiff is still a worn gasket. If you have to fight the lid to get it to seal, or if steam leaks persistently from one spot even after cleaning the sealing surfaces, the gasket is the first suspect.

The overpressure plug and safety valve

The overpressure plug — a small rubber plug in the lid, sometimes called a safety plug — is a backup safety device: if pressure inside the canner climbs too high, the plug is designed to release before the canner itself is damaged. Some canners use a metal safety valve or a fusible plug instead. These parts are not optional, and they are not interchangeable between brands. A hardened or cracked plug may not release as designed, and a plug that has already blown must be replaced, not pushed back in and reused. If your canner manual lists a replacement interval, follow it; if it does not, inspect the plug every season and replace it at the first sign of hardening, cracking, or distortion.

The dial gauge

A dial gauge tells you the pressure inside the canner, and your entire tested process depends on that reading being accurate. Dial gauges drift: a gauge that reads low is dangerous, because you may believe you are at pressure when you are not, and a gauge that reads high wastes time and can overprocess food. Most cooperative extension offices test dial gauges for free or for a small fee, and annual testing is the standard advice. If testing is not available near you, or if the gauge is damaged, stuck, or reads inaccurately, replace it with the gauge made for your canner model. Weighted-gauge canners avoid this issue entirely, since their weights, not a dial, set the pressure — one reason many beginners prefer them, as explained in best pressure canner for beginners and pressure canning for beginners.

How to match a part to your canner

Canner parts are model-specific. A Presto gasket does not fit an All American canner, and a Mirro gasket does not fit a Presto, even when the canners look similar. Start from the make and model printed on your canner — usually on the bottom or on a plate on the pot — and match the part number in the manual or on the manufacturer's parts list. For older or secondhand canners, the model number matters even more, because manufacturers have changed gasket designs over the years. If you cannot find a model number, contact the manufacturer with a photo of the canner and lid before ordering. Buying the wrong gasket is the most common parts mistake, and it is entirely avoidable: measure nothing, guess nothing, match the model.

Comparison: replacement gaskets and parts by canner brand

Pick	Fits	What to check before ordering	Best for
Presto canner gasket	Presto dial- and weighted-gauge canners, by model number	Your exact Presto model; gasket designs vary by model	Most common home canners; easiest parts to find
All American canner gasket	All American metal-to-metal canners that use a gasket, by model	Whether your All American uses a gasket at all — many seal metal-to-metal and use no gasket	Owners of gasketed All American models
Mirro canner gasket	Mirro canners, by model number	Your exact Mirro model; older Mirro gaskets differ from current ones	Older and secondhand Mirro canners
Replacement dial gauge	Dial-gauge canners, by make and model	Thread size and pressure range for your canner	Any dial-gauge canner with a drifting or damaged gauge
Overpressure plug / safety valve kit	By make and model	Whether your lid uses a rubber plug, a fusible plug, or a valve	Seasonal safety maintenance on any canner

When to replace: the inspection checklist

Inspect your gasket, plug, and gauge at the start of every canning season, and again any time a batch misbehaves. Replace the gasket if it feels stiff or brittle instead of flexible, if you can see cracks, nicks, or flat spots, if it has stretched so it no longer sits snugly in its channel, or if steam leaks around the lid after you have cleaned both sealing surfaces and seated the lid correctly. Replace the overpressure plug if it is hard, cracked, distorted, or has ever blown. Replace or re-test the dial gauge if it sticks, reads inaccurately against a tested gauge, or has been dropped or damaged. Keep a spare gasket on hand: gaskets always seem to fail on the day you planned a big batch, and a spare turns a cancelled day into a ten-minute fix.

Two maintenance habits extend the life of every part. First, wash the gasket in warm soapy water after use, dry it fully, and store it flat or lightly in place — never folded or stretched over something. Some canners direct you to remove the gasket for storage, others to leave it in the lid; follow your manual. Second, never use cooking oil or petroleum jelly on a gasket unless your manual specifically tells you to: oil can degrade some rubbers, and a gasket that needs lubricant to seal is usually a gasket that needs replacing. If you are troubleshooting repeated seal failures on jars rather than the canner, the problem is usually elsewhere — see why didn't my canning jars seal — but if the canner itself will not hold pressure, start with the gasket.

What about AliExpress parts?

AliExpress lists canner gaskets and parts at low prices, and for a common Presto-style gasket the listing may look identical to a name-brand part. We evaluated that route and do not recommend it for pressure canner safety parts. Fit is the problem: a gasket that is a fraction of a millimeter off in diameter or thickness may look right and still leak, or seal unevenly, and a safety plug from an unknown maker has no verifiable release specification. For jars, lids, and tools, a generic part is a minor inconvenience if it disappoints; for a pressure vessel, it is not. Buy safety parts by exact model from the canner manufacturer or a reputable parts seller, keep the packaging with the part number for next time, and treat any part whose origin you cannot verify as unsuitable for a pressure canner. That caution is consistent with how this blog treats every safety-critical purchase: the cheapest option is only a bargain if it is the right part.

Installing a new gasket

Remove the old gasket, clean the lid channel thoroughly with warm soapy water, and dry it. Seat the new gasket evenly all the way around, without stretching or twisting it, and check that it lies flat in the channel with no bulges. Close the lid and check the fit before you load jars: the lid should close smoothly and evenly. Then run a test with water only — a few jars of water, or an empty run as your manual directs — and confirm the canner reaches and holds pressure with no steam leaking around the lid. A water test costs a little time and saves a batch: if the new gasket leaks, you have found out with water, not with a full load of food. After a successful test, note the replacement date on a label or in your canning notes, so you know the gasket's age next season.

Verdict: what to buy first

If your canner is more than a few seasons old and you have never replaced a part, start with the gasket made for your exact model, plus a spare overpressure plug. Those two parts cover the most common failures, cost little, and take minutes to fit. If you run a dial-gauge canner, add a gauge test — through your local extension office if available — to the same pre-season routine, and replace the gauge if it reads off. If your canner uses no gasket, because it seals metal-to-metal, your maintenance list is shorter: keep the sealing surfaces clean and undamaged, replace the safety plug on schedule, and test or replace the gauge as needed. In every case, the rule is the same: exact model match, reputable source, and a water test before the first food batch. A canner that holds pressure steadily is the foundation every safe batch on this blog depends on, from green beans to canned meat and the beef stew, beans, and soup guides in this batch.

One last caution: never modify a canner, never substitute a part from another brand "because it fits," and never run a canner with a damaged safety device to "get through one batch." If a part is damaged and you do not have the right replacement, freeze the food and can another day. The food will keep in the freezer, and the canner will be ready when the right part arrives.

Frequently asked questions

How often should I replace a pressure canner gasket?

There is no single calendar answer: it depends on use, storage, and the rubber itself. Inspect it every season and replace it at the first sign of stiffness, cracking, stretching, or leaking. Keeping a spare on hand means a worn gasket never cancels a canning day.

Can I use a universal gasket on my canner?

Only if your canner manufacturer lists it as fitting your exact model. Gaskets are model-specific, and a close-looking gasket that does not match can leak or seal unevenly. Match the model number, not the appearance.

Do All American canners need gaskets?

Many All American canners seal metal-to-metal and use no gasket at all. Check your model: if it has no gasket, do not add one, and focus maintenance on the sealing surfaces, the safety plug, and the gauge.

How do I know if my dial gauge is accurate?

Have it tested by your local cooperative extension office, which usually offers the service free or cheap, and repeat the test every season. If testing is unavailable or the gauge reads off, replace it with the gauge made for your canner model.

Can I buy canner gaskets on AliExpress?

Listings exist, but we do not recommend them for safety parts: fit and release specifications cannot be verified, and a slightly wrong gasket or plug on a pressure vessel is not a safe saving. Buy safety parts by exact model from the manufacturer or a reputable parts seller.