Nipple Water Drinkers Water Nozzle for Rabbit/Poultry Use (Rabbit Use 10pcs) Works great for rabbits, guinea pigs, ferrets, rats, large mice and possibly other pets. Connects to very flexible 1/4" Inside diameter poly tubing or will fit all 5/16" inside diameter poly tubing. Can be disassembled for easy cleaning Water nipples work under low pressure (5 psi or less). Securely attach to any wire cage with hole spacing from 1/2" up to 2" square.