A grommet for sealing a first aperture formed in a splice enclosure includes a body that is receivable within the first aperture, and is subjected to a compressive force exerted by a sidewall of the splice enclosure defining the first aperture while the grommet is installed within the first aperture. The body defines a passage extending from a first end of the body to a second end of the body. A collar is coupled to a sidewall of the body defining the passage. The collar defines a second aperture that is closed as a result of the compressive force exerted on the sidewall. The collar is deformable to receive the cable within the second aperture while the grommet is installed within the first aperture to seal an interface between the collar and the cable.