DUROMATIC gaskets are engineered to last a very long time. A gasket, when properly cared for, should last between 1 and 6 years under normal use. What are the variables? The number of times per week you use the cooker, what you cook, and how you clean your gasket all are considerations. If you cook everyday with a lot of chilies, or beans (which contain enzymes) and are careless about placing your gasket next to your knives in the sink, you could be replacing it more often! Hand washing is recommended. Unless you are experiencing trouble with the cooker coming under pressure, the gasket is sound.
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