I bought a brand spanking new water bottle for my ASF's last weekend. Filled her up and thought all was well in the world. These guys go through a lot of water during the day, so I bought a larger size.

Except, I return in the morning to see this.



So I start messing with the sipper valve ball, and water is coming out, the rats hear the ball and run over and start drinking like none other.

Feeling sorry for the guys, I gave them a couple of bowls of water to help quench their thirst.



Turns out, if this particular bottle isn't straight up and down, the air bubble doesn't float to the top and let more water out.

Oh well, swapped it out with another of the same brand and size, and it works fine!