Allows you to connect a gravity reservoir (e.g. 5-gallon bucket) that will connect with the 3/16" Flex-Tubing to provide, instead of connecting to a main water line and pressure regulator.

Pros: In the event of a flood, only the amount of water in the bucket will be released; possibly saving many rodents (and a big cleanup) if gone un-noticed or during the middle of the night.

Cons: Water level has to be monitored and filled; how often depends on how many racks it's connected to and how many animals will be drinking from it. It's recommended that no more than one 5-gallon bucket be used per rack.