Part number 0311-880046 identifies an Aero (OEM) Easy Cover Adjustable Pivot Extrusion E/C Tension Bow. This specialized part is a component of Aero Industries Easy Cover tarp systems. It acts as an adjustable pivot point and a tensioning element for the "bows" or cross-members that support the tarp. This extrusion helps maintain the proper curvature and tension of the tarp system as it extends and retracts.