A nipple drinker works differently from a bowl — instead of a standing reservoir of water sitting open to the shed environment, water only comes out when the animal presses or nudges the nipple valve with its mouth, and it shuts off again immediately after. That keeps the water genuinely clean between drinks, since there's no open surface for feed particles, dust, or waste to fall into and foul the supply the way an open bowl can.
The Goat Nipple is sized and calibrated specifically for how goats actually drink — the fitting and flow rate that works well for cattle is generally too large or too high-flow for a goat to use comfortably, so this is a distinct product rather than a smaller version of a general livestock nipple. It connects to a plumbed line as part of an automatic nipple-drinker system rather than working as a standalone item.