... Couplings, Elbows & Nipples in China. Specification Data:Alloy: HaiMei Rigid Aluminum Conduit and Accessories are manufactured from 6063 Aluminum ... alloy.Standard: Haimei Rigid Aluminum Conduit and Accessories are listed by Underwriters ... Steel, UL6A.( certify No. E 310429)Thread Protection: Haimei Rigid Aluminum Conduit is shipped with a coupling on one ...