Old vs new drink tubes.Some CBRN CBRN Chemical, Biological, Radiological, and Nuclear CBRN Caribbean Basin Radar Network specialists still haven't have·n't Contraction of have not. haven't have not haven't have gotten the word that there are now two totally different internal drink tubes for the M40/M42 masks. You need to know what's what Verb 1. know what's what - be well-informed be on the ball, be with it, know the score, know what's going on know - know how to do or perform something; "She knows how to knit"; "Does your husband know how to cook?" because the newer drink tube coupling call be replaced by you, but the other coupling requires a whole new face piece. The new drink tube looks like a stretched Z-it has two bends bends: see decompression sickness. . The old tube has only one bend Bend, city (1990 pop. 20,469), seat of Deschutes co., W central Oregon, on the Deschutes River, at the eastern foot of the Cascade Range; inc. 1904. Lumbering is the primary industry, and tourism is also important. . 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. NSN NSN National Stock Number NSN Nokia Siemens Networks NSN National Storytelling Network NSN NATO Stock Number NSN New Substances Notification (CEPA) NSN National Student Number (NZ) NSN Never Say Never 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 the coupling is damaged, no problem. Just replace them like it says in the procedure beginning on Page 2-54 of TM 3-4240-346-20&P. [ILLUSTRATION OMITTED] But if the old drink tube coupling is damaged, your only solution is to turn in the face piece for replacement. Don't don't 1. Contraction of do not. 2. Nonstandard Contraction of does not. n. A statement of what should not be done: a list of the dos and don'ts. use the new drink tube with the old coupling or visa versa. That puts the drink tube in the wrong position for drinking. Here's a handy chart you can use to help keep track of what's what:
New Internal Drinking
Characteristic Old Internal Drinking System System
Drinking Tube L-shaped, one bend Z-shaped, double bend
Tube Coupling Angled Straight
Repair Parts Internal Drink Tube, Internal Drink Tube,
NSN 4240-01-260-8711 NSN 4240-01-441-0557
Facepiece Assembly Internal Drink Tube
(used to replace damaged Coupling,
internal drink tube NSN 4240-01-462-0045
coupling),
NSN 4240-01-415-4517 Small
NSN 4240-01-415-4518 Medium
NSN 4240-01-416-0430 Large
Note: Tube coupling is
permanently mounted and
cannot be directly replaced
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