Automatic water feeders can be used for Rats, ferrets and other small animals.

10 - 3/16” solid Brass Nipples

The (SE3) Water Drinking Nipple is a popular valve for use with mice, rats, gerbils, hamsters, birds. It is easy to activate. The valve is made of solid brass, with a stainless steel stem,

These use 3/16” inside diameter tubing