PS Magazine - TB 43-PS-689

PS, The Preventative Maintenance Monthly

ISSUE 689

APRIL 2010
PS Magazine - TB 43-PS-689 - Page 25 of 33
46
PS 689
APR 10
47
PS 689
APR 10
F
or several years, the M40/M42-series masks have had two totally different internal
drink tubes. And the difference makes a difference. One drink tube coupling can be
replaced by CBRN specialists, while the other requires a whole new facepiece.
The new drink tube looks like a stretched
Z–it has two bends. The old tube has only one
bend.
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.
The new drink tube can be used only with
the new drink tube coupling. If the new tube
disappears or the coupling is damaged, no
problem. Just replace them like it says in the
procedure in TM 3-4240-346-23&P. See WP
0012 for the internal drink tube and WP 0021
for the coupling.
But if the old drink tube coupling is damaged,
your only solution is to get a new facepiece.
Don’t use the new drink tube with the old coupling or vice versa. That puts the
drink tube in the wrong position for drinking.
Here’s a chart to help you identify and replace drink tubes and their couplings:
Dear Half-Mast,
We are trying to figure out which is the correct second skin to use with
our M40 and M42 masks when worn with JSLIST. There are two types
of second skin in the field: one is plain and one has a pronounced lip with
hooked tabs on both the top and bottom. Which one should we use?
SSG M.H.
Dear Sergeant M.H.,
The plain second skin is simply called second
skin and the one with the tabs is called the
universal second skin (USS). Both work fne
with JSLIST and come in two sizes, small and
medium/large. But the second skin is pretty
much out oF the Army inventory. So order the
USS:
small,
NSN
and
medium/large, NSN 4240-01-413-1543.
Don’t Forget that when you wear JSLIST,
you don’t need to wear the quick-doFF hood For
the mask. The JSLIST hood provides suFfcient
protection. You will need the quick-doFF hood
For the M42A2 mask because it’s not worn with
JSLIST.
Old Internal Drinking System
New Internal Drinking System
Characteristic
Drinking Tube
Tube Coupling
Repair Parts
L-shaped, one bend
Angled
Internal Drink Tube,
Facepiece Assembly
(used to replace damaged
internal drink tube coupling),
NSN 4240-01-415-4518 Medium
Note:
Tube coupling is
permanently mounted and
cannot be directly replaced
Z-shaped, double bend
Straight
Internal Drink Tube,
Internal Drink Tube Coupling,
M40/M42-
Series Masks…
Drink Tubes:
There is a Difference
What’s the
Correct
Second Skin?
Order universal second
skin to wear with JSLIST
hmmm,
should I
wear the second
skin or universal
second skin with
jslist?
doesn’t
matter!
either one
works
for me!
New and old drinking tubes
New and old couplings
JSLIST…
New
Old
New
Old
689.46-47.indd
1-2
2/22/10
4:45:23 PM
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