A drinker system, comprising: a central pressure regulator configured regulate a fluid pressure to a regulated input pressure； and a plurality of pressure reducers each comprising: a high-pressure zone configured to receive the fluid from the regulator at the regulated input pressure, a low-pressure zone configured to provide the fluid to one of multiple drinker lines at a low output pressure maintained at a constant proportion to the regulated input pressure, and a moveable integral piece comprising a small diaphragm rigidly connected to a large diaphragm, wherein the small diaphragm is disposed in the high pressure zone and the large diaphragm is disposed in the low pressure zone, and wherein the constant proportion between the low output pressure and the regulated input pressure corresponds to the ratio between the surface area of the small diaphragm and the surface area of the large diaphragm.
