I have a 2 gallon glass jar. It doesn't fit the loop is too large, the cap hangs down.
I loved how easy it was to install. It solve the problem I was having with my dog, licking the water dispenser knob.
Perfect for protecting the spicket head on my water cooler from my dogs licking the spicket head.
My pretty glass water dispenser started to drip, drip, drip. I used to come home to a puddle of wasted water. This little cap fits perfectly and solved it! And I have two to spare. Love it. Get it... it works!
Fit well, and worked great!