PS Magazine - TB 43-PS-605
PS, The Preventative Maintenance Monthly
ISSUE 605
APRIL 2003
PS 605
APR 03
49
One Tip, One Correction
PS 605
APR 03
48
M40/M42-Series Masks…
Drink Tubes Not All the Same
L
isten up, NBC NCOs. Internal drink tubes and their couplings for the M40/M42-
series masks are not all the same. Some drink tube couplings can be replaced by you,
but others can’t. So it's important to know which kind you've got.
The new drink tube looks like a stretched Z—it has 2 bends. The old tube has only
one bend.
The new drink tube, NSN 4240-01-441-0557, can be used only with the new drink
tube coupling, NSN 4240-01-462-0045. If the new tube disappears or its coupling is
damaged, you can replace them with the procedures that begin on Page 2-54 of TM
3-4240-346-20&P.
But if the old drink tube coupling is dam-
aged, the whole facepiece must be turned in
for replacement.
The old coupling has a squared base and
points upward toward the front voicemitter
and nosecup ridge. The new coupling is
straight and points out of the facepiece.
Don't try to use the new drink tube with the
old coupling or vice versa. That puts the
drink tube in the wrong position for drinking.
• If the M40/M42 drink tube is too
close to the soldier's face when
you're testing with PATS, the vacuum
created by PATS can cause the drink
tube to stick to his skin. Then PATS
will give a false reading because no
air is being sampled.
The solution is to rotate the drink
tube 90° to the right. That keeps the
drink tube away from the soldier's
skin. Of course, once you're finished
testing, remember to rotate the drink
tube back to where the soldier can
reach it with his mouth.
• If a mask has any tears, cuts, holes
or sticky or soft patches in the face-
piece, it's non-mission capable.
Period. Get a new mask. The PMCS
in TM 3-4240-346-10 is being
changed to make that clear.
now a
z-shaped tube
like
me
can have
its coupling
replaced
by
you!
but this
other guy
-
his coupling
can’t
be
replaced!
NBC NCOs, these
two points
will
point the way to
easier evaluation
of your unit's
M40/M42 masks…
Any tears, cuts, holes, or sticky
or soft spots make mask NMC
New and old drinking tubes
Rotate drink tube 90° to right,
away from soldier’s mouth
New
Old
605. 48-49 (C)
2/24/03
1:13 PM
Page 1
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