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
Marta Siphon - 120cc - 4oz Plastic bird waterer from Italy - 1 7/8" diameter x 3 7/8" high with spout on. Easy on and off and holds about 4 ounces. Shorter water tube for tight spots. Available in Clear or blue. I love these water bottles!