These bottles are fine. Some reviewers have written that they leak, but they don't. I have been raising rabbits and using these bottles for many years and they are great. How to use them: First, I take out the duck from the inside as it isn't needed. Then when you fill the bottle and turn it upside down, you need to stabilize the water in the bottle. Swipe your finger under the roller. Once you see bubbles, it will likely stabilize. Hang it in the cage and run your finger under the roller a couple of times to check again. If you see bubbles, remove your finger and you should be fine. I've never had a problem with those Kaytee bottles "leaking". Much luck.
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