How does that PVC waterer work anyways?

Hatrick

Songster
10 Years
Apr 4, 2009
195
0
119
So after looking at and being jealous of Monk's delightful coop, I want to install the same type of waterer in our small coop, but I don't understand how it works.
Is there some type of fitting inside that prevents the water from just flowing out?
You fill it from the top right? If that entire tube is full of water then how is it not coming up and out?
I don't understand.
 

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