Abstract: A connector assembly for connecting a cable to an externally threaded port comprising a tubular connector body with an internally threaded connector element thereon, a resiliently deformable sealing element having a first portion tightly encircling the port and a second portion tightly encircling the connector element, the diameters of the two portions defining to provide a stepped internal shoulder, the internal shoulder including a truncated conical surface defining a circular internal sealing lip being deformably engaged by the end of the connector elememt and axially compressed between the connector element and a port abutment surface.