A quality package from both J&J and TTV's concentric butterfly valves. The highly visible 360 degree visual position indicator offers immediate local valve open or closed identification. This offers complete assurances for operators with critical line applications on site with clear visibility available at all times. The lugged design of the TTV valves is great as it allows you to easily disconnect either side of the piping system without having to remove the valve itself. Lugged Butterfly Valves are used to control the flow of fluids in a piping system. They have threaded inserts on both sides.