I think you will like this fluid extractor when you use it to change oil in your BMW. Post your experience/question(s) after you received and used it.
To tighten the screws on black top you need 8mm wrench to keep the nut under it from turning. Don't over-tighten it, you may damage the seal under the black top.
One importance note: push the large tube to the container firmly until you hear a click, then pull the blue cap out a little to seal it, otherwise you may have a small air leak. To remove the tube from the container use one hand to push in the blue cap while the other hand pull out the tube.
You made a right decision in going with the Amazon warehouse deals, who really cares about the box, damaged or not.
To tighten the screws on black top you need 8mm wrench to keep the nut under it from turning. Don't over-tighten it, you may damage the seal under the black top.
One importance note: push the large tube to the container firmly until you hear a click, then pull the blue cap out a little to seal it, otherwise you may have a small air leak. To remove the tube from the container use one hand to push in the blue cap while the other hand pull out the tube.
You made a right decision in going with the Amazon warehouse deals, who really cares about the box, damaged or not.