The Hen Hydrator Waterer keeps your water clean and helps prevent disease. The translucent bucket allows easy viewing of the water level. Blue color provides UV protection to prevent algae growth. Gravity-fee hen hydrator provides access to clean water on demand Lid fits tightly to prevent spills and protects contents while easy to remove fill plug alllows for refilling 4 nipples can accommodate 4 birds each. 3.5 Gallon Capacity.