Cast iron bowl has brass push-button non-siphoning water valve with built-in flow control. Push-button watering is popular because there is no paddle to wear out or become jammed with dirt hay etc. This bowl is self-cleaning and trouble-free big enough for sows and small enough for little pigs. Recommended water pressure range is 5 to 65 p.s.i. Bowl has 3/4" male NPT connection. We stock all repair/replacement parts. Wt. 4.5 lbs.