Flexible Metal Conduit - Reduced Wall Finish Galvanized Steel Trade Size 3/4 in Inside Diameter 0.81 in Outside Diameter 1.11 in Bend Radius 4 in Overall Length 25 ft Flexibility Flexible Corrosion Resistant Gray Conduit Type Reduced Wall Series 5500 CSA 69271 Federal Specification AA-5810 Type IV R14141 UL 1479