Abstract: A coupling for non-metallic flexible electrical conduit is formed of a one piece lightweight molded thermoplastic cylindrical sleeve having a pair of threads extending inwardly toward opposite ends. Spaced axially inwardly from the inner end of each thread is an annular sealing ring having a sloped leading face and a perpendicular trailing face with the faces intersecting at a sharp annular edge. Lengths of conduit are engaged over opposite ends of the coupling and rotated to advance the conduit lengths over the sleeve. A liquid tight engagement is effective between each conduit length and the coupling when the conduit length advances past the sealing ring.

Abstract: A swivel coupling for electrical conduit is formed of a pair of arcuate tubular sections joined together at a pair of connecting flanges. A liquid tight seal is provided by an O-ring which seats in registered annular grooves in the face of each flange. A coupling nut tightens the flanges against one another. Formed at the end of one of the sections is a junction box fitting including a threaded nipple which is inserted through an opening of the junction box until a stop nut, positioned on the nipple, engages the box. A tightening nut is engaged over the nipple from the interior of the junction box to secure the swivel coupling to the box. The end of the other tubular section includes a conduit fitting for securing a length of electrical conduit. Because the stop nut is installed after the coupling nut has been advanced past the nipple, a reduced diameter coupling nut may be employed.

Abstract: A liquid tight connector for non-metallic conduit is formed of a one piece body having a through bore. A sleeve extends inwardly from one end of the body and a threaded nipple extends inwardly from the other. Projecting transversely from the inner end of the nipple is a flange. A ferrule skirt extends from the flange toward the sleeve end of the body to define an annular channel concentric with the sleeve. An internal buttress thread is formed on the inner wall of the skirt. An end of a length of conduit is slipped over the end of the sleeve and into the mouth of the channel. The connector is rotated relative to the conduit, with the thread engaging an outer wall of the conduit to tightly draw the channel over the conduit. An outward flare is provided at the flange end of the sleeve to compress and seal the conduit.