Reduce chore time with these auto-filling gravity flow drinkers. Size: 6"H, 3" pan dia. and 1.5" pan depth. Water groups of penned birds by filling a bulk tank Waterers easily mount to metal wire pens or cages (holes will need to be cut) Connect to a tank or bucket as a water supply. Cups refill as water is consumed, keeping fresh water in front of the flock. 3/8" Tubing and connectors (sold separately) are needed for you to design a drinking system. If using with rabbits, its metal bowl is chew resistant. Mounts from outside of pen. Water groups of penned birds by filling a bulk tank. Saving time during chores. Waterers easily mount to metal wire pens or cages (holes will need to be cut). Connect to a tank or bucket as a water supply. Cups refill as water is consumed, keeping fresh water in front of the flock. 3/8" Tubing and connectors (sold separately) are needed for you to design a drinking system, using cups and bowls, to match your needs. If using with rabbits, its metal bowl is chew resistant. Mounts from outside of pen. Size: 6"H, 3" pan dia. and 1.5" pan depth. How to Use: Mount drinkers to pen or cages. Fit tubing over the filling nipples. Run tubing to an external reservoir (bucket, barrel, tank). For multiple drinkers: Use T-connections to connect drinker lines to a main feeder line. The main line is connected to a large reservoir sized to accommodate all of your birds.