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often.
Vents allow air to be exhausted from the canner and to permit the release of steam as needed. A petcock or weight is used to control the escape of air or steam.
In addition, all pressure utensils have a safety plug of some type which goes into action when the pressure inside the canner gets too high. A metal alloy safety plug will melt, allowing excess steam to escape or a composition type plug will be blown out. The usual reason for this is a drv canner.
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