A method is provided for sealing a through-fitting around a cable. The method involves: passing a cable through the through-fitting; compressing a seal in the through-fitting around the cable within the through-fitting; and extruding a sealant around the cable within the through-fitting. Both compression of the seal against the cable and extrusion of the sealant around the cable within the through-fitting are performed by causing a cap on the through-fitting to move axially. Causing the cap to move axially may comprise turning the cap to permit threads of the cap to move along mating threads of the through-fitting.