The Taco 571-4 is a 3/4-inch sweat connection, normally closed (N.C.) two-way zone valve designed for HVAC and plumbing applications. It operates on 24 volts and features a manual override, allowing for manual control in case of power failure or maintenance. This valve is ideal for controlling the flow of hot or chilled water in heating and cooling systems, providing efficient and reliable performance. 

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https://www.partshnc.com/571-4-taco-34%22-sweat-nc-24v-two-way-zone-valve-with-manual-override