Weber # 30174399 Grill Cover Fits Built-in Summit S440 and S460 Gas Grills. Replaces part # 7557 and 9922. This Cover is lighter weight than original part # 7557 or 9922 This cover is polyester. The back has two clips that will attach to the rear vent of the grill. The front has 2 straps that will loop around the handle of the grill. Please visit Weber’s website to ensure you order the correct parts for your specific grill. It is best to look up by serial #.