Plastic very flexible drinking bowl with a tube valve.
-Adjustable water outlet flow due to the nozzle in the valve
-Connection from above 1/2" external thread
-Easy to clean, because there is no pressure tongue
-Smaller drinker so less pollution
-Deepened water reservoir
-Mounting on walls or vertical tubes 1 1/2" tot 2"
-Plastic version is intended for hobby use, and is not intended for intensive use