Mustang Survival Sentinel Series, Owner'S Manual

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2.   To close, pinch the toggle while pulling the elastic drawstring 

away from the neck. For maximum effectiveness the neck seal 

should be adjusted to be snug, but not uncomfortably tight

3.   Once the neck seal has been drawn tight, the velcro tabs can be 

attached to keep the elastic out of the way.

4.   To loosen, insert fingers between the neck and the neck seal while 

pinching the toggle. Then gently pull on the neck seal with your 

fingers to loosen.

RUBBER NECK  AND WRIST SEAL FITTING (IF EqUIPPED)

The Rubber Neck Seals and Wrist Seals may be trimmed at the initial 

fitting, but the seals tend to adjust to the wearer after a short period 

of time. If no excessive seal restriction exists, and seal fit is acceptable 

to the user, the seals should be left as is. Neck seals shall fit snugly 

and remain in direct contact with the neck through all normal head 

movements. Wrist seals shall fit tightly enough to prevent water entry, 

but not tight enough to restrict blood flow. If seal sizing is required, 

proceed as follows:

caution:  trim neck seals with extreme caution. a 
smooth trim line is essential. excessive or careless 
trimming could result in loose seals that leak and 
necessitate replacement. avoid nicking seal fabric, as 
this could result in tearing the seals when donning and 
doffing, and also could result in skin irritation. trim 
only 1 ring at a time.  you can always trim more, but 
you can’t replace what you have cut off.

1.   If neck seal trimming is necessary, turn the neck seal inside-out so 

you can see the rings running parallel down the gasket around the 

circumference of the neck seal. 

2.   Trimming only one ring at a time carefully cut between the rings 

with a very sharp pair of scissors.

i)  An alternative method is to place the neck seal inside-out, so 

the trim rings are facing out, over a large metal coffee can and 

carefully cut between the rings using a very sharp razor blade 

(x-acto knife or utility knife style).

note: Visually inspect the trimmed edge for nicks.  if 
the cut is not smooth and straight carefully trim out 
any nicks.  nicks can cause a tear during donning and 
doffing