After seeing all the great reviews on this extractor I ordered it thru Prime and received it in 2days.  When I saw the box, I immediately noticed that the name and model of the unit was different than what was shown on the amazon description, but the extractor looked similar, just a different branding sticker on it.  Then when i opened the box, I noticed some marks on the extractor tube, which made me think this item may have been used or potentially damaged.  Regardless, I was content with keeping it, if it worked with no issues.  I went to do an oil change on my audi a4 (b8) and it couldn't hold a vacuum in order to keep the oil (which was warmed up) flowing. I'm an engineer and have worked on cars since I was a kid, so I certainly trouble shooted to make sure it wasn't human error on my part and that in fact the product was not functioning as designed.