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  1. Hello everyone, I have a few technical question about my de-airing Shimpo pugmill NVA-04S. Right near the pressure valve, there is a little cylindrical glass container which used to be empty and after a few months of using the machine, it is now completely filled with porcelain. Could anyone please tell me how I could clean this little glass container and what it is for exactly? My other question is about the oil. The can of oil that came with the machine when I bought it this summer is now finished. Could you please tell me what kind of oil I can use? Thank you very much!