Velux Ztf0140010 10' Flex Tunnel Extension For 14" Sun Tunnel, Alum, 3"L X 16-1/4"H X 16-1/4"D Brand - Velux Description - 10 Ft Flexible Tunnel Extension For 14" Sun Tunnel Manufacturer's Part Number - ZTF0140010 Length Inches - 3 Height Inches - 16-1/4