Instruction-Manual (Extract; full-version as download: click below the item-picture on "media"):

The Round-Drinker is a very practical automatic drinker for poultry. It can be suspended as well as being placed on the floor of the coop. This drinker is, as all low-pressire-automatic drinkers for poultry, only suitable to be used at LOW PRESSURE. This means that the maximum water pressure is 2m between the Round-Drinker and the top of the water level of the water tank.

Connecting this drinker directly to the service pipe is NOT POSSIBLE! You can obtain low pressure by placing a float tank (Art. 20185) between your drinker and the service pipe.