The Belimo ZG-AFB118 Crank Arm Adapter Kit is a specialized accessory designed for use with AFB and NFB series actuators in HVAC systems. It enables secure mechanical linkage between the actuator and damper shafts, ensuring precise motion transfer and control. By converting actuator rotation into controlled damper movement, it supports accurate airflow regulation in air handling units and ventilation systems. Its durable construction enhances installation flexibility, improves system reliability, and reduces maintenance requirements, making it essential for efficient and consistent HVAC damper operation.