The advantage&feature of Pig nipple drinker Thread connector: 1/2” NPT(American Pipe standard) Raw material : Stainless steel Adjustable plastic filter with dome Strainers can keep the impurity out. High quality of O-Ring can service many years. 100 PCS/CTN package is easy to carry. Laser Logo is available. Competitive price and high quality. Water saving and Labor saving. Hygeian water can keep pig in healthy raise.