The Belimo ZG-AFB118 Crank Arm Adapter Kit is a part of the actuator that enables easy installation on HVAC systems where direct coupling to the damper shaft is not possible. This kit consists of a mounting bracket ZG-118 and a crank arm KH-AFB which allows the use of actuator in different series like AFB, AFX, NFB, and NFX. It can also be mounted horizontally or vertically depending ... https://www.partshnc.com/crankarmadaptrkit-for-afbnfb-5