20PCS Rabbit Water Nipple Drinker Feeders Automatic Waterer Fountain for Ferrets Product Feature: PERFECT:for Rabbits, Ferrets, Chinchilla or any other small animals, Can be used with a variety of wire cages. QUALITY:Good structure design, removable lower parts for easy cleaning. RECOMMENDED:For 3 small mammals per nipple. Recommended for a Gravity Feed System. MULTI USE:Very easy to use, just connect it to the hose pipe and hook it to rabbit cage, save your labor And Time. Does not require a drip cup. Product Specification: Material: Zinc alloy Installation Caliber: 7.5-8 mm diameter water pipe Internal structure: With Internal Spring Package Included: 20 x Rabbit Water Nipple Drinker Feeders