Part number 0311-963049 identifies an Aero Economy Easy Cover Chain Guard. This component is specifically designed to protect the chain mechanism on Aero Industries Economy Easy Cover manual dump truck tarp systems. It's compatible with models such as the Aero Economy Easy Cover (Models 40, 45). The chain guard helps to shield the chain from debris, dirt, and environmental elements. This protection is vital for ensuring the smooth and reliable operation of the manual tarp system.