10 pack of auto-fill watering cups. These are great for chickens, quail, and other bird
Cups come with a wing nut for easy install. Just drill a 5/16” hole into any size bucket and install the cup.
Threads on the cups are 1/8” and can be used with PVC fittings with 1/8” threads
Cups are approximately 2.75” wide and 1.75” in depth 
These are study and strong compared to other styles