The Cambridgeport Air Sys 417 Bridgeport 417 2 1/2" ST Flex Connector Malleable Iron is used to connect flexible metal conduit to box or enclosure. This product is RoHS Compliant, UL 514B File No. E9391, CSA File No. LR39354, NEMA FB-1, Federal Specification A-A-50553, and cULus Listed.