The Resideo 40003918-008 2-Way Conversion Kit (Steam) Zone Valve is a reliable component designed to convert standard 3-way zone valves into 2-way operation for steam-based HVAC systems. It provides precise control of steam flow in boilers, radiators, and heating zones, improving comfort and system efficiency. https://www.partshnc.com/40003918-008-resideo-2-way-conv-kit-steam-zonevl