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The Topaz line of steel, compression type EMT couplings provide a secure, concrete tight joining of thin wall EMT conduit. Compression type design promotes easy installation; steel construction with zinc plating ensures strength and longevity. Available in sizes from 1/2” to 4”; UL listed and NEMA FB-1 approved; always in stock and ready for fast delivery. NEMA/ANSI FB-1 compliant.