Products which indicate on macsales.com that "This item cannot be returned for a replacement" cannot be returned to OWC. These products are not covered by an OWC warranty, but may be covered by a warranty from the original manufacturer. Please contact the respective manufacturer for assistance after purchase. A list of manufacturers by name and contact phone number can be found here https://eshop.macsales.com/Service/Tech.cfm.
1-800-275-4576