401-010T 1" PVC Threaded Ball Valve is a quarter-turn valve that employs a perforated, hollow, and rotating ball to regulate the flow through it. The valve opens when the hole of the ball is aligned with the flow and closes when it is revolved 90-degrees by the handle of the valve. Commonly used in chemical process, potable water, irrigation, water treatment and wastewater, landscaping, and pool applications.