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Presto 9979 pressure cooker regulator steam release valve. The pressure regulator/steam release valve fits onto the vent pipe located on the primary cover handle. It indicates when 15 pounds pressure is reached and controls pressure inside the unit. A steady flow of steam escaping from the pressure regulator/steam release valve and the sound of the steam venting indicates that proper cooking pressure is being maintained. Fits Presto models 0128303, 0136304, 0137001, 0137003 and 0137005.
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