BLS maintenance training - Replacing the inner mask with relative valves and valve holders

To replace the inner mask N/8, equipped with relative valve holders MI/25 and inhalation valves NG/26, first pull down the locking ring of the inner mask to release the inner mask, then remove the inner mask from its housing, unthreading the edges from the inner connection MI/21. Replace the inner mask with the new one, checking the right assembling of the valve holders MI/25 equipped with the NG/26 valves, positioning the edges of the hole in the fitting groove of the MI/21, pulling down again the locking ring MI/26.

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