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Ceiling Adapter, Series Wall-Trak, Material Non-Metallic, Color Off White, Compatible with Product Type Wall-Trak Raceways, Features Also use for Ceiling Feeds, For Connecting Conduit to Raceway, Has Combination 1/2 in, 3/4 in and 1 in Trade Size Knockouts, Overall Height 3 1/4 in, Overall Length 4 in, Overall Width 2 1/4 in, Standards CSA Certified, UL Compliant