Highly durable, this Center CB brass manual ball valve with two ports and 22mm compression end connections is ideal for commercial shut-off use. A ball valve is a type of quarter-turn valve featuring a hollow, perforated ball that pivots to control the flow of a fluid. The valve is open when the ball's hole is in line with flow and closed when pivoted to 90°. The long lasting reliability of ball valves makes them popular in a wide range of settings.