Heavy Duty Automatic Chicken Poultry Waterer Feeder Nipple - Stainless Steel, Threaded with Gasket - Set of 5 Easy to install in any thick-walled container, such as a bucket, PVC pipe, etc. Freedom to design a watering system based on YOUR needs Manufacturer recommends 1 unit for every 2-3 birds More sanitary system for watering your poultry Features a rubberized gasket and entire unit can be taken apart. Most other units do not have the gasket and will not unscrew.