The Presto Pressure Canners require a rubber gasket (aka sealing ring) to go inside their lids. It will need replacing from time to time.
The lifespan of a gasket and plug depends upon the amount of pressure canning you do.
For Presto models….
- 01745 (16 quart, weight only)
- 01751 (18 quart dial gauge)
- 01755 (16 quart, dial gauge)
- 01781 (23 quart dial gauge)
… you want Presto part number 09985. It is very inexpensive.
That part number gets you a box that has in it both the replacement sealing ring (aka gasket) and the overpressure plug come together in a package. Presto wants you to replace both at the same time.
Users suggest to plan proactively to replace both the gasket and plug at the same time every year or two, so that you don’t get a sealing ring failure right in the middle of a big canning session.
If you store extra rings, how long they are good for in storage depends, frankly, on who you speak with at Presto. Some reps will say two years; some will say they are good in storage for up to 5 years after the date of manufacture (but you will have no idea of what that manufacture date was.) Some reps will say “don’t store them at all” because some people would store spares for ten years and then be cross when the spares were no good. If you keep a spare in storage, date when you purchased it.
If you live in isolated areas, or do a great deal of canning, you will probably want to keep a spare ring on hand, anyway. Even if the replacement does go bad because you had it in storage so long, the cost of it is so low that it could just be worth the cost as “insurance” just in case.
We always keep a spare one on hand, dated.
The Presto gaskets are now made of a synthetic rubber and don’t need oiling.
These are inexpensive, and should cost you no more than around 10 to 15 bucks in North America.
Just Plain Marie Facebook post. 20 April 2015.