What is this weird thing?

[hbru123]

This was found at a WW2 Military training base where I have found rations and land mine pieces, the black pieces in the middle I am pretty sure is old rubber, there is also a red band that is rubber on the outside. I have no idea what it is.

Thanks!

 

[hbru123]

Only other thing is about a 1960s GM gas cap , while missing the outer cover lock ring.
My 63 vw gas caps pretty close, they all use a outer 3 tab twist cover rubber vent
and rubber/cork seal inside

Interesting!

Thanks!

 

[hbru123]

some sort of valve damper
maybe a back valve preventer
one way in, no way out
Brady

Ya! That's interesting.

Thanks!