An extra flexible, galvanized steel conduit used in tight or constrained spaces. FU-X series is a helically wound, non-UL rated metallic conduit used in applications that demand higher levels of movement, vibration and bending. Designed for use where an extra flexible metallic conduit is needed in machinery for protecting hydraulic or pneumatic hoses or in elevated temperature conditions. Use with FU-M series metallic fittings for IP40 ratings.