Customer satisfaction is our #1 priority so we accept returns within 30 days of purchase. Please contact us prior to sending back any purchased items for return authorization.If an item is returned without authorization, a 15% restocking fee will be deducted from the total return amount. Full refund will be made if return is properly authorized. Refunds will only be issued after item is returned and received by The Injector Shop. Customers are responsible for all return shipping costs if item is returned for any reason other than item defect. The Injector Shop will cover return freight charges for defective items as long as the item has return authorization and is inspected for damage from improper installations or misuse/application.