"The nesting jar reduces storage space and its lug design makes attachment easy, while the low profile enhances stability. Jars are molded from durable, transparent polyethylene so the water level is always visible.Snap on base also permits quick and easy cleaning, as there are no threads to accumulate dirt and germs." - Green Garden Chicken
This waterer is awesome! Works great for a small flock and is long lasting. I had mine for three years before I stepped on it (my fault). I would highly recommend these waterers, they are small and great!