A stopcock turns just 90 degrees in it's fitting so it is fundamentally on or off. For water fittings it has a long actuator switch so it very well may be found effectively and killed regardless of how old it is. These valves are ordinarily of metal which withstands consumption well. The following is the basic design of a stopcock. This valve is for air and has brisk separates. Most are strung. At the point when the actuator is parallel to the body of the valve it is "open."