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

The Mini-Round-Drinker is a very practical automatic drinker for chicks, quails and other smaller 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 Mini-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.