Features Includes Automatic Water Feeders + T's and Springs Ideal for Rabbits, Ferrets, Chinchilla and other small Mammals. Manufacturer recommends 3 animals per nipple Does not require a drip cup. Can be used with a variety of wire cages Very easy and quick to assemble Built-In Cage Clip On The Side Built-In Adjustable valve, uses 5mm allen key to adjust Specifications Tubing ID: 5/16 360 degree stainless steel nipple Weight: a few grams per assembled nipple Material: Stainless Steel T Color: Red, White, Clear Colored T's. Might be a small variety of color Be sure to install the Flared Out part of the nipple on the bottom side Special Note: It is recommended to wait on purchasing tubing till you receive your feeders. See what tubing works best for your application. Some people use 5/16 ID tubing, but it may be too lose and hose clamps may be required. Some have said they used 1/4 ID tubing with no issues. Note: This product is packaged in our Poultry bags but are designed for Rabbits, Ferrets, Chinchilla and other small Mammals.