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AQ25742B | 4zoneExpansionPanelfor2wireVlv | Resideo Product Type_Elbow Non-Condensing 90 DEG Its superior construction and ergonomicAQ25742B 4zoneExpansionPanelfor2wireVlv by Resideo The AQ25742B 4 zone expansion panel from Resideo is designed for use with 2 wire valves in HVAC applications. It allows for the control of up to four zones of heating or cooling, providing greater flexibility and efficiency in temperature management. This expansion panel is a valuable addition to any commercial or industrial HVAC system, offering reliable performance and enhanced control capabilities.