Practically unbreakable! Jar features ribbing for extra strength and is injection molded for a smoother inside with no turned-in bottom lip to hold back water and have a buildup of bacteria. The red base attracts birds so they will drink more. The jar has a 7" mouth that is easy to twist; the base locks and twists instantly. The jar and base nest for minimum space in shipping and storage. 1-gallon capacity. This 1 Gallon fount may be a few cents higher than others, but is much sturdier!