Sure-Flex PVC Outside Corners are pre-molded and are used for fl ashing outside corners on a variety of details. Installation is fast and easy with no cutting or stretching required. This product is available in white, gray and tan. Carlisle’s PVC Outside Corners are part of the Certifi ed Fabricated Accessory (CFA) program. Certifi ed Fabricated Accessories are the only factory-fabricated PVC accessories that meet the stringent quality tolerances required to be included in a Carlisle warranted roofi ng system.