@
Netherdead, do you have the same issue with Oxygen Sealers output vent or are you necro-ing an old thread?
All the Oxygen Sealer issues have been fixed recently, they should now work smoothly and correctly in all situations. (OK, with slight lag if you try to seal / unseal a space larger than 100,000 blocks.)
So: if you are seeing a bug with Oxygen Sealers
in the latest Galacticraft build (that's build 1043 as of today) then definitely please report it, we want to fix bugs as soon as they are known + proved reproducible, not leave them for 2 months!