Abstract: In a bulkhead penetrator comprising a housing, a first grommet plate having peripheral recesses therein and adapted to be received by the housing, a grommet for disposition adjacent the first grommet plate in the housing and having bores therein alignable with the recesses, a second grommet plate for disposition adjacent the grommet in the housing and having peripheral recesses alignable with the bores of the grommet, and a retaining ring for connection to the housing to lock the second grommet plate, the grommet, and the first grommet plate in the housing with the second grommet plate recesses and the grommet bores and the first grommet plate recesses being adapted to receive and retain cables extending from outside the bulkhead, through the penetrator, and into a compartment defined in part by the bulkhead, an improvement wherein the retaining ring comprises a plurality of discrete sections, each of the sections being mountable on the housing, and the grommet comprises a plurality of discrete portions, each