A cable connector assembly (2) comprises a connector body (6) adapted to be mounted to a cable, a resilient first seal (30) for sealing between the cable and the connector body and having a first aperture, and a seal opening device (44) adapted to extend through and enlarge the first aperture, and having a hollow body part (46) for enabling part of the cable to extend through the first aperture without engaging the first seal, wherein the seal opening device is adapted to be removed from the connector body to enable the first seal to resiliently engage the cable.