Bib cock is a type of spigot valve used for controlling the flow of liquids. It is usually made of brass or plastic and has a small handle for controlling the flow. The name bib cock comes from the fact that it resembles a bib, or apron, in shape. The valve is typically connected to a pipe or hose, and can be used to regulate the flow of liquids from a faucet or showerhead. Bib cocks are commonly used in bathrooms, kitchens, and other areas where liquid needs to be controlled.