Inner Diameter 8 . Length 11 . Material .006 Stainless Steel Continuous Weld. UL Listed. Use to connect inserts with rectangular flue outlets to Oval Flex Connectors. Top plate can point straight up or back towards the damper. Made from 11 gauge carbon steel. Ventinox components are made from either 316SS VFT or superferritic stainless steel VG . Components feature an integral locking band, avoiding the use of pop rivets. Liners and components provide a penetration free top to bottom connection. When venting solid fuel heaters, Ventinox VFT must be insulated with either TherMix or ProFoil blankets to meet UL 1777 requirements. For all other applications, insulation is highly recommended for increased efficiency and draft performance.