Explosionproof Conduit Reducer Coupling, Large End Trade Size 2-1/2 Inch, Small End Trade Size 1-1/2 Inch, Material Copper Free Aluminum Alloy, End Style Belled, Enclosure Class I Group C D, Class II Group E F G, Class III, Approval UL, Constructional Feature Dust-Ignitionproof, Explosionproof