The original lubing red cup drinker with 3/4 in threaded black bung so you can build your own system. These cups are made in Germany, as they have been since Bellsouth introduced them to Australia.
Water depth in the red lubing cup should be about 1/3 of the cup, so the cup acts as a lip and the bird is drinking as normal.
These are low pressure poultry drinkers, top of water in container should be no higher than 30 cm above the red lubing cup drinker.