I use a set of clear and a set of blue and change back and forth, helps me to keep track of where I'm at and be sure everyone gets fresh water!
These tubes work great for the smaller birds like finches and canaries
Top Rack Dishwasher safe
Livorno Siphon - 400cc - 13.5oz Plastic bird waterer from Italy - 2.5" diameter x 6.00" high with a long lip. Easy on and off and holds almost 14 ounces, 400 cc. Available in Blue and Clear. Fits 1/2" vertical cage bars. I love these water bottles!