A Two-Way Plug Valve is a type of valve with two ports: an inlet and an outlet, typically labeled A and B. It features a cylindrical or conically tapered plug that can be rotated inside the valve body to control the flow of fluid. The plug has one or more hollow passageways that align with the ports when the valve is open, allowing fluid to flow through. The two-way design means that the valve controls flow in one direction only, providing a straightforward and often economical solution for regulating fluid flow.