An environmental seal between two compartments, such as in a process transmitter, linked by a passageway contains an electrical cable. The seal includes a stop, a cable gland body, a compression bushing, a cable gland nut, and a first elastomeric seal. The stop projects from an interior surface of the passageway. The cable gland body is in contact with the stop and encircles a portion of the electrical cable. The compression bushing is within the cable gland body and encircles the portion of the electrical cable. The cable gland nut compresses the compression bushing and seals the compression bushing against the electrical cable and against an interior surface of the cable gland body. The first elastomeric seal seals between an exterior surface of the cable gland body and the interior surface of the passageway.