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~