Here’s a couple of recall notices. Thanks to Nick for pointing them out.
First, OMS BCs sold between May 2006 and Aug 2008. There is a risk of the seal ring cracking.
Secondly, Mares Nemo Air Dive Computers sold between July 2008 and July 2009. An O ring in the high pressure air connector can leak.
For more information on either of these issues, plus some older ones, you can go to OMS’s website.