Nipple Waterers and Sparklets Water systems
Think about it (dog waterers too). They don't have air holes on them. At least my dog waterer doesn't, yet they don't create a vacuum inside preventing my dog from drinking. And all the Sparklets bottles that I have seen, don't have holes in them to prevent a vacuum. When the water comes out, you will notice a "bubble" and "gurgle", that is air going back inside preventing a vacuum.
In fact, if there was a hole on the bottle, then the water would continually run, since the air pressure would push it out. The reason it doesn't run is that the pressure inside is controlled by the amount of air that gets back inside from the air bubble gurgle. (that is, on dog waterers and sparklets bottles)
Hi Kate, Thanks for the info on the dog waterers, I've never had one like that but obviously it works. When I got the info on making my nipple watering system using a 5 gallon bucket I was told it needed a tiny hole, so that's what I did -- no leaks though. The only time I had a leak (continuous dripping) was when the nipple and o-ring weren't well seated.
