I'm sorry it took me so long to reply, Jenn.  I'm swamped with work, since
I'm going home for Passover and want to get everything done so I don't have
to lug books with me.  My cushion is the Varilite.  I found their web site
at http://www.varilite.com/seats/.  I'm not sure if I can accurately tell
you about the valve, since my CP doesn't affect my upper body... but it's
about the size and pressure of a toothpaste cap, maybe a little larger.

Thank you to everyone for all of the leads on organizations!  I'll follow up
on them when I have a minute to breathe.


~Joy~