Ignoramus28889 fired this volley in
:

I opened the valve up, taking copious pictures. I do see that one seal
inside seems to be completely broke. It seems to be made of yellow
polyurethane or some other yellow translucent material.


Seal? O-ring? Cup? Not all "rubber" (not counting urethane, which is an
aliphatic plastic resin) o-rings are black. 'could be urethane, but that's
a material that doesn't like sliding friction as much as Buna-N or
Neoprene.


Lloyd