Owfeel10 Pcs Stainless Steel Automatic Pig Nipple Water Drinker Feeder Waterer for Sows Piglets Drinking Stainless steel spring and dome screen Adjustable flow,save water and labor Suitable for Sows, Boards, Fattner Pigs, Growers and piglets Thread Connector: 1/2" NPT (American Pipe Standard) Thread diameter :3/4inch /19mm