D.S.S. will accept returns for shelf stocking parts in new condition for up to 15 days from date of purchase. You must call D.S.S. Inc. before returning any item. You will receive an RGA (Return Goods Authorization) number that must be clearly marked on the outside of the package to be returned. You must also include a copy of the original invoice with the returned item. Failure to comply may result in a delayed or denied result. Authorization to return an item should not be interpreted as final approval of return status. All returns are carefully inspected to determine sales worthiness as a new item. All returned items must be in unused condition and in undamaged original packaging. Used, altered or damaged merchandise will not be refunded. In the event that an item is not approved as a return, it is the purchasers responsibility to pay for any shipping charges incurred should he/she wish the product be returned to them. All returns are subject to a 20% restocking, inspection and re-boxing fee along with any credit card - bank fees. Shipping charges are not refundable. Return freight must be prepaid by the purchaser. IMPORTANT! No returns on special order, made to order, custom, and non-stocking items. Standard Bore pistons are not stocking items and therefore are not returnable. Please verify final bore size before ordering.