1.Invert head harness over front of mask assembly and lay the mask face down on a non-abrasive surface with the exhalation valve closest to you.

2.Grasp the internal drink tube at the drink tube coupling and pull the internal drink tube away from the coupling.

3.To install a new internal drink tube, press the internal drink tube until it bottoms fully against the drink tube coupling.

Internal Drink Tube Adjustment (Figure 32)

fig. 32

Note: The internal drink tube may irritate the lips if it touches them while wearing the mask assembly. Slight pressure on the top of the exhalation valve body should enable the internal drink tube to be grasped by the user’s lips.

1.Have the user put on the mask assembly and check to see if the internal drink tube touches the lips.

2.If the internal drink tube touches the lips while wearing the mask assembly, adjust the length of the internal drink tube as follows:

a.Remove the internal drink tube from the mask assembly.

b.Cut internal drink tube behind first barb.

c.Install internal drink tube.

3.Repeat steps 1 and 2 as necessary to achieve proper fit.

CAUTION

Do not remove the last barb as this is needed for proper function.

3M™ FR-M40-107 Side Voicemitter Kit (Figure 33)

fig. 33

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