A ferrule-type fitting for forming a fluid-tight seal between an insulated electrical conductor extending from outside a well to a wellhead barrier and a rigid tube that surrounds the electrical conductor and extends through the wellhead barrier. A tubular body fitting with an elongated opening...http://www.google.de/patents/US5823256?utm_source=gb-gplus-sharePatent US5823256 - Ferrule--type fitting for sealing an electrical conduit in a well head barrier 
