This is a set of two Kobayashi Siphon (Small) K-61 waterers. Ideal for watering multiple birds such as bantams, chickens, and pigeons. The siphon system maintains a constant water level. Water is replenished as it is consumed. As it is a siphon-type waterer, the upper and lower parts are easy to separate. Although unused, there is some soiling due to storage in a warehouse, so please understand this before purchasing. Thank you for looking.