Watering nipple ideal to make any bucket into a drinker. Can be installed in round or square plastic buckets, or PVC pipe. Drip-free and leak-free. Horizontal side-mount design allows waterer to hang or be placed on a flat surface. Provides chickens with cleaner water and less mess. 4 nipples can make one waterer and accommodate up to 20 chickens. Package includes 4 nipples.