I made this to be able to suck fluids and/or other messy things (when cleaning pipes for example) with a normal vacuum cleaner. One green hose goes down the bottle and the other green hose down in whatever you want to suck up. The big stump connects to the vacuum cleaner's hose.
But be careful, my vacuum cleaner was too strong and imploded the first plastic bottle that I tested with. I needed to changed to a "stronger one". :)
See it in action here: