I have a machine that has two podiums connected by 20' of what looks like FMC but it is not. Instead of the clamp-type fittings like would be used with FMC it has a two-piece threaded connector that seems to be integral to the conduit. The end of the conduit is flared to hold the fitting on. It looks very similar to a cord strain relief only without the rubber insert. The conduit is far more durable than flex would be. It is damaged pretty badly yet will still not pull apart. Anybody know what this is? My local distributor came up blank. Also, on the fitting is engraved "Hubbell F-3". Thanks in advance.