Stainless steel nipple valve delivers clean water on demand. Goat drinks directly from tip. Slight pressure on nipple lets water flow; it shuts off when released. Even kids smell the water and learn to use the valve quickly. Provides clean water with no problems of water bowls soiled by dirt, manure, bird droppings. Threads onto standard 1/2" pipe fittings. Works on full line pressure from 10 to 100 psi. If nipple is used indoors, a drain below it is helpful.