3M FR-M40 - Manual (Page 22)

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4. To install a new quick disconnect coupling lay the mask assembly face up.
5. Insert the quick disconnect coupling into the external drink tube and with a twisting motion, pressing
the drink tube in place. The tube should extend over the nipple end of the quick disconnect coupling
approximately 3/4 inch (19 mm).
Note: The quick disconnect coupling tube connection may be moistened with water to aid in inserting it in
the rubber tubing.
6.
Re-install quick disconnect coupling in retainer on side of exhalation valve cover.
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products, contact your local 3M representative
3M Occupational Health and
Environmental Safety Division
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