Abstract: A self-threading fitting having external threads at one end and tapered internal threads at the other end is provided with a snap-in tubular lining of insulating material which extends beyond the end of the fitting having the internal threads for insertion into a conduit to which the self-threading fitting is to be secured to thereby provide a guide which will insure axial alignment of the fitting with the conduit while insulating through wiring from the metal fitting.

Abstract: The fitting has a main part which has two axially spaced corrugations, one for engaging the corrugations of the tube, the other engaging the hose projecting from the tube. A sleeve with outer corrugations engages the hose from the inside. Armoring is clamped separately onto the outside of the main part.

Abstract: A connector assembly for attachment to the end of a compressible plastic covered conduit having a spiralling groove on the inside thereof, the connector assembly including an air impervious cylindrical sleeve member enveloping the compressible plastic covering and terminating at its outer end in a continuous annular inwardly and axially outwardly extending resilient seal-forming lip. A coupling member is provided having a sleeve portion with an external threading which snugly interfits with the spiralling groove on the inside of said conduit, thereby to expand the conduit outwardly to compress said compressible plastic conduit covering up against the inner surface of said sleeve member to form a liquid and airtight seal thereat. The coupling member has a flange which is axially held in a liquid and airtight sealing relationship with the continuous annular lip of the sleeve member.

Abstract: This is concerned with a fabricated connector, and method of making it, for joining flexible conduit to a terminus, such as a box or enclosure or the like. The connector has a sheet metal fabricated housing that free-wheels on the flanged end of a body member and is provided with a threaded pilot that is adapted to project into the inside of the end of the flexible conduit.