A curb box, typically located between a building and the district's water main lines (a part of water supply network), is a vertical cast iron sleeve, accessible from the public way, housing the shut-off valve for a property's water service line.
It is typically located between a building and the district's water main lines and usually consists of a metal tube with a removable or sliding lid, allowing access to the turn-key within. A water distribution system is a part of water supply network with components that carry potable water from a centralized treatment plant or wells to water consumers in order to adequately deliver water to satisfy residential, commercial, industrial and fire fighting requirements. A curb box (also known as a valve box, buffalo box, or b-box) is a vertical cast iron sleeve, accessible from the public way, housing the shut-off valve (curb cock or curb stop) for a property's water service line. 
