An apparatus configured to couple to an electrical penetration assembly, the apparatus comprising: an inorganic body (101, 300) comprising an outer housing body (117, 303); a plurality of electrical conductors disposed within the inorganic body (101, 300) and configured to transmit electrical and/or optical signals from an electrical penetration assembly through the apparatus; an inorganic electrical insulator sleeve (104, 700) disposed between the inorganic body (101, 300) and the plurality of electrical conductors, and configured to insulate the inorganic body (101, 300) from the plurality of electrical conductors; an inorganic flange (115, 301) disposed on the inorganic body (101, 300); a plurality of sockets and/or pins operatively coupled to the plurality of electrical conductors and configured to transmit an electrical and/or optical signal between the electrical conductors and the electrical penetration assembly; an inorganic sealing ring disposed in communication with the inorganic flange (115, 301) and configured to deform and seal the inorganic flange (115, 301) and/or outer housing body (117, 303) to the electrical penetration assembly; and wherein the apparatus further comprises a threaded connector nut (114, 400) comprising a lap flange (116, 405) configured to engage the inorganic flange (115, 301), the connector nut (114, 400) having a relief feature configured to provide thread relief and clearance for the inorganic flange (115, 301) and/or inorganic sealing ring. an inorganic body (101, 300) comprising an outer housing body (117, 303); a plurality of electrical conductors disposed within the inorganic body (101, 300) and configured to transmit electrical and/or optical signals from an electrical penetration assembly through the apparatus; an inorganic electrical insulator sleeve (104, 700) disposed between the inorganic body (101, 300) and the plurality of electrical conductors, and configured to insulate the inorganic body (101, 300) from the plurality of electrical conductors; an inorganic flange (115, 301) disposed on the inorganic body (101, 300); a plurality of sockets and/or pins operatively coupled to the plurality of electrical conductors and configured to transmit an electrical and/or optical signal between the electrical conductors and the electrical penetration assembly; an inorganic sealing ring disposed in communication with the inorganic flange (115, 301) and configured to deform and seal the inorganic flange (115, 301) and/or outer housing body (117, 303) to the electrical penetration assembly; and wherein the apparatus further comprises a threaded connector nut (114, 400) comprising a lap flange (116, 405) configured to engage the inorganic flange (115, 301), the connector nut (114, 400) having a relief feature configured to provide thread relief and clearance for the inorganic flange (115, 301) and/or inorganic sealing ring. an inorganic sealing ring disposed in communication with the inorganic flange (115, 301) and configured to deform and seal the inorganic flange (115, 301) and/or outer housing body (117, 303) to the electrical penetration assembly; and wherein the apparatus further comprises a threaded connector nut (114, 400) comprising a lap flange (116, 405) configured to engage the inorganic flange (115, 301), the connector nut (114, 400) having a relief feature configured to provide thread relief and clearance for the inorganic flange (115, 301) and/or inorganic sealing ring.