Part number 0311-862272 identifies an Aero Industries Easy Cover Legacy Teardrop Arm Guard Rubber Bumper. This is a replacement part for older "teardrop" style crossbars on Aero Industries Easy Cover tarp systems. It functions as a protective bumper, typically sliding onto the aluminum cross arm. This rubber bumper helps absorb impact and protect the tarp system's arms during operation. It's an OEM original replacement designed for direct fit and easy installation.