This gas pressure reducer, provided with a safety function in the event of low pressure, comprises a lever (16) comprising a first part (16a) pivotally mounted on the body (1) around a first axis (17a), and capable of closing off said gas inlet (3), and a second part (16b) pivotally mounted on said first part (16a) about a second axis (17b) and cooperating with a finger (15) integral with the membrane flexible (9).
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