Ignoramus28889 fired this volley
in :
http://igor.chudov.com/projects/Brid...ract-2-CNC-Mil
l/27-Univer-AE-1001-Four-Way-Pneumatic-Valve/
Yeah... sigh... that is urethane, and it is a "cup" (in a sense... it sure
ain't an o-ring).
Time for a rebuild kit or a replacement valve.
LLoyd