Replace Vented Oil Fill Cover 4 Hf Predator 3500 Watt Inverter Generator Product Details vented oil fill cover for the Harbor Freight Predator 3500 watt inverter generator Some early model generators were so well sealed that the engine could not get enough air. This would cause a surging condition so the fix was to remove the oil fill cover. This door is meant to fit snugly, forcing it in could cause the tabs to break This new cover, will allow you to have a cover to keep large debris out of the Includes:Oil Fill Cover Door,Basic Washable Filter,Hardware not included Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.