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RT4026 is a Tow-Rite EZ-Lube grease dust cap designed for compatible trailer hubs rated at 2,000 to 3,500 lb. Its open design provides access to the EZ-Lube lubrication system while helping protect the hub from dirt and debris. The product listing specifies a 2" diameter. Before ordering, verify the hub's required cap diameter and confirm that it uses an EZ-Lube system to ensure proper fitment.