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That's a design flaw I see with these little waterers. They create a vacuum lock that's hard to break sometimes. You can use regular glass Mason jars with these, but it's easier to get the water flowing to the water ring base with the plastic jars that are sold with the waterer. Once the jar is filled, if you turn it right-side-up, and water doesn't start flowing to fill it up, just use your hands to squeeze the jar slightly, and water will be forced out until it fills up over the outlet to create the vacuum again. Also, if you use a glass jar, don't fill it all the way to the top, screw the base on, tilt it back over slowly with the water outlet up towards the ceiling, and the water will run out. Otherwise, if you rotate it upright quickly, it creates a vacuum too quickly to let the water out. Once you've got it flowing at first, it will work fine until empty.