The Resideo V8043E1020 Zone Valve is a 1" sweat connection valve designed for HVAC systems. This N/C valve is electrically powered and requires 24V to function while the valve’s flow coefficient is 3.5 Cv to enable the control of water flow within the HVAC system. It comes with a brass valve body, and a stainless steel stem, which are strong components that make the product durable. ... https://www.partshnc.com/v8043e1020-resideo-1-swt-24v-nc-35cv-wendswtch