Review (4/5): Careful what you dispense
Bought a couple of these to dispense various chemicals in the workshop: alcohol, acetone, and mineral spirits. The suction mechanism did NOT like the acetone and quickly stopped sucking.
Interestingly, after flushing with water, it did start functioning again, so not all was lost. But if you intend to put something not-so-benign in them, consider yourself forewarned.
Other wise they work fine, and as advertised.