I have been looking at setting up a nipple watering system for my girls. I have a pressurized line that runs about twenty five feet away, and would take little effort to run a shallow trench into their run, and set up a nipple watering system for them. My question is this: Does anyone know if chickens can operate a nipple waterer if I have it operating under pressure? Most I have seen constructed are gravity feed, so I am not sure if they can handle the pressure of my system.