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TM 3-4240-280-10

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2-2.<br />

b,<br />

DESCRIPTION OF MASK (CONT).<br />

Nosecup Assembly.<br />

l Nosecup (1) is a soft rubber cup<br />

which fits firmly over your nose and<br />

mouth. It contains two one-way<br />

valves and houses the microphone.<br />

l Nosecup valve seats and disks(2)<br />

are one-way valves which allow<br />

clean air to enter the nosecup for<br />

normal breathing but prevent moist<br />

exhaled air from contacting and fogging<br />

the lens in cold weather.<br />

l Microphone (3) fits into pocket in the<br />

nosecup to transmit your voice<br />

through the aircraft or tank communication<br />

system.<br />

2-4

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