The KMC Controls MCP-1140-5520 Pneumatic Damper Actuator Assembly is a reliable 4-inch stroke actuator designed to control HVAC dampers using 8–13 PSI pneumatic pressure. It converts compressed-air signals into mechanical movement, positioning connected dampers accurately to regulate airflow. Commonly used in air-handling units, ventilation systems, rooftop units, and commercial HVAC ... https://www.partshnc.com/mcp-1140-5520-kmc-controls-act-assm-4-strk-8-13-clevis