Product Description Taco Comfort Solutions develops and manufactures products and systems for both residential and commercial applications. These include circulators/pumps, valves and controls, air-dirt separators, heat exchangers, buffer and expansion tanks, domestic hot water recirculation and accessory products, and sophisticated building management controls. From the Manufacturer Taco Zone Valve Controls simplify the wiring nightmare. They work with 2-, 3- or 4-wire zone valves and their easy-to-follow PC board layout eliminates the problems caused by incorrect wiring and the unfinished look of conventional zone valve installations. External indictor lights give you instant diagnostic feedback and reduce installation time. Use them combined with Taco Zone Valves and Thermostats to maximize system performance and dependability.