2 pack of Top fill 1 Liter (33.8 Ounce) water bottles with flip top easy fill lid and stainless steel nipple. No more removing bottles to refill water! This drinker allows for a gravity flow automatic water source for your pets. The flip top lid allows for easy refill without needing to remove the bottle from the cage. Water level is easily checked with the translucent bottle. Metal bottle hanger is included to ensure your bottle will mount to any style of cage.