Thomas & Betts 870S Conduit Body Cover Brand: Thomas & Betts. Part Number: 870S. T&B Replacement Conduit Body Cover, Oval, 2-1/2 to 3 in Hub, For Use With: Form 7 EMT/Rigid Threaded Conduits, Stamped Steel, Clear Chromate Coated/Zinc Plated. Additional Description: TB -870S 2-1/2-3 IN STAMPED STL CVR, FORM 7 FORM 7 & NEOPRENE GASKET. Catalog Description: Form 7, 2-1/2 Inch to 3 Inch Stamped Steel Conduit Body Cover and Neoprene Gasket..