Double union pvc ball valve is one of the most frequently used plastic shut-off valves. A rotary ball with a bore is located in the center. The bore can be oriented inline or perpendicular to the piping by rotating the ball 90 degrees to open or close the media flow. Double union ball valves come with union ends in either socket or threaded type connections and are an ideal choice for a broad variety of plumbing applications due to its maintenance-free design and strong temperature resistance. As one of the most often used plumbing materials, double union pvc ball valves are renowned for their strength and durability.