1-1/2 MALL RGD SET-SCREW COUP - RIGID SET SCREW COUPLING NO-THREAD MALLEABLE TYPE CONCRETE - TIGHT WHEN TAPED CONNECTS RIGID/IMC CONDUIT TO BOX OR ENCLOSURE MALLEABLE IRON MEETS UL STANDARD 514B, FED SPEC W-F 408E, NEMA FB-1 CONCRETE-TIGHT WHEN TAPED