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100% copper wire, UL-recognized, single-build insulation rated at 200°C (Class H), meets UL file E-37683 or E-34609. Also meets federal specification J-W-1177/13 or J-W-1177/14. Tubular and Open Frame Solenoids use single-build insulation rated at 130°C. It meets UL file E-34609 or E-37683 and Federal Specification J-W-1177/9.