Review on Large Black Automatic Waterer Rabbitnipples Com by Jessica Griffith

Bought two of these to use in the chicken coop with rain barrels on the platforms as a water source. I should be able to produce at least 3psi from gravity feed, which should be enough to fill those potions. But not a single drinker is filled with a full 50 gallons of water. I took them off, cleaned them and hung them up again and only a drop of water remained. Very frustrating. I think I need to keep looking for something that works.