EMT Conduit Coupling; Type Set Screw; Trade Size 2-1/2 Inch; Diameter 4 Inch; Length 2.88 Inch; Material Zinc Electroplated Malleable Iron; Constructional Feature Concrete-Tight; Standard Package 10; Approval UL 514B; Used On EMT Conduit; ROHS Compatible; Applicable Standard Federal Specification WF-408E, NEMA FB-1