Abstract: A plug assembly for sealing a conduit. The assembly includes an annular, deformable sealing member, bound by an inner surface that includes opposed convexly curved surface portions. Opposed disks, each having an annular boundary edge, are positioned with the boundary edges of the disks underlying the inner surface portions of the sealing member. These disks are drawn together to produce radial expanding of the sealing member in regions where the member overlies the disks.

Abstract: A plug assembly for encircling a cable and encapsulating it within a conduit includes a first and second ring members, each of which is formed of resilient material and has an inner wall conformable to a circumferential portion of the cable's outer surface. A rigid spacer is disposed between the first and second ring members for defining a sealant-receiving channel therebetween. Sealant material, such as a silicone compound, is dispensed within the channel, and a compression means associated with the plug assembly is operable for deforming the first and second ring members axially and radially, thereby to deform the channel so that at least some sealant material received in the channel is displaced into the region between the inner walls of the first and second ring members and corresponding portions of the cable's outer surface to provide a cushion/sealant between the ring members and the cable.