We have an anaerobic chamber Bactron 900 from Sheldon. After one year of use the sleeve assembly deteriorate at a point it was not possible to use the chamber anymore. They send a replacement pair for free under the warraty, but it took 3 months to arrived. And not even 2 month after this pair was install, it started to broke again.

Does anyone have this anaerobic chamber, and do you have the same problem?