Finally, someone got it right!!We have had indoor pet rabbits for 26 years. Finding a critter waterer has always been a chore. They always leak, filling up the cage bottom or the litter box if that is where you decide to hang it. Something we could never really evaluate was, "How much is our critter REALLY taking in"? Sure, whenever going for the bunny check up, they always ask, "Is she drinking OK, any thing odd"? We always had to say, "NO CLUE, we fill the bottle, so I guess so".We used to order Morton waterers from out in California, but they are gone. Those were "Push-Pin" valves rather than roller balls like all the pet stores have. They were good, but dripped.This thing is great!! NO LEAKING, not a drop. No dripping like the other waterers leak down the bunnies chin and jaw as well as the bottom of the cage tray. We have a black critter tray from Tractor Supply under the main cage tray, which used to catch the water leaking from the Morton bottle. Since we got this great waterer the black tray is Dry-As-A-bone!! She gets her house cleaned every weekend and litter box more frequently. The bottom / outer walls of the cage are dry as well.When you get it, everything is inside the bottle. The red top must be removed to get the stuff out. It is difficult to get off, just be patient, it really does come off. I would not recommend prying with anything, be patient. Pay close attention to putting the valve together and remember, your critter will be drinking from it, so use clean or sterile tools.We ordered 2 additional bottles for spares because if you need it, you will wish you had and they are cost effective.Be patient!!To the people who made this GEM, thank you so much!!