The Daikin-McQuay 107179807 2-Position Normally Closed Actuator is an electromechanical control device designed to operate valves or dampers in HVAC systems. It works by receiving an electrical signal that opens the normally closed actuator, regulating the flow of air or water as required, and automatically returning to the closed position when power is removed. Commonly used in air h... https://www.partshnc.com/107179807-daikin-mcquay-24v-2pos-nc-actuator-96-leads