Ball valves control water flow with a plastic ball that rotates as the handle is turned. In the open position, a large hole through the ball is aligned in the direction of water flow, allowing the water to flow unobstructed; in the closed position the hole is aligned perpendicular to the direction of water flow, blocking the flow. Ball valves are more reliable and controllable than gate valves which makes them ideal for most shut-off applications in pond construction. We have many different types and qualities Ball Valves available. If you have any questions about these Ball Valves, please feel free to contact us.