The system is based on these. They are poultry drinking nipples. They work just like a water bottle for a hamster. The chicken pecks at the nipple and drops of water come out.I chose the saddle-style nipples rather than the kind that are threaded and screw in because the saddle-style ones are easier to work with. They can be removed, replaced and reused. The screw-in kind can be replaced, but not reused.n the photo, the nipples are pointing up. During use, they will be straight down. Richard used a section of 2x4 to mount the PVC pipe on the wall of the coop. Once the bulkhead tap is opened, water flows through the black hose and into the PVC pipe. When a chicken pecks at one of the drinking nipples, water drips out.