hdtran
Geography Police
Search this forum for O-ring. I'll give you a handy link, though 
http://www.scubaboard.com/showthread.php?t=95195

http://www.scubaboard.com/showthread.php?t=95195
jbb:...snip...
Do either of you know how to get a new gasket for the underwater case?
Thanks.
Jason.