The Honeywell M6410A1029, also known as the 24Vfltgactforv58Xx, is a 24-volt floating actuator intended to precisely control water flow in a variety of HVAC systems. It works with Honeywell's V58xx series valves, which are frequently used in hydronic heating and cooling systems in homes and businesses. https://www.partshnc.com/24vfltgactforv58xx-12-34-2