I have been using these for months now. Refilling 4 5 gallon jugs once a week. They are sturdy, and they seal very well. I am also able to turn the full jug upside-down to place into the water cooler with minimal spills. My advice is to slowly place it into your water cooler, the little plug is not technically a seal, so if you just drop it into the dispenser, when the plug pops into the bottle, it sprays water. But if you do it gently, it isn't an issue.
Rating:
[5 of 5 Stars!]