Take the rubber ring out of the lid.
Wash it with warm soapy water.
Dry it.
Oil it with vegetable oil.
Now do you see how the rubber ring has a groove around it on the inside? Push your thumb into the groove and work it around the ring, you're trying to spread the rubber V out.
Put it back in the lid and take it for a test run.
In the future store your cooker with the lid upside down on top, keeping it closed will ruin the seal.
If it still won't seal replace the rubber parts, you can get a kit for your cooker from presto.
Regards
TickMagnet.
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