Hydro Rigid Aluminum Conduit adheres to Underwriters Laboratories UL-6A, latest revision 2004, UL514B, American National Standards Institute (ANSI) C80.5 and Federal Specification WW-C-540c. Hydro Aluminum complies with Military Standards: MIL-STD-129 and MIL-STD-649. Hydro Rigid Aluminum Conduit, Couplings and Elbows are extruded through porthole dies using 6063 alloy with a T-1 temper (ASTMB221 or ASTM–B429). This material meets all ductility test requirements and has been visually inspected for any defects.