The Schneider Electric (Erie) VT3213G13A020 is a high-performance 1/2-inch sweat connection, 3-way normally closed valve that excels at providing precise control in HVAC systems. It is an essential part of controlling fluid flow for heating and cooling applications because it runs on a 24V power supply. https://www.partshnc.com/vt3213g13a020-schneider-electric-erie-12-swt-3-way-nc-24v