A compact one-piece shrinkable sleeve of minimal outside diameter made from either a resilient material or

a heat shrinkable material having elastic memory and adapted to be secured to the end of an electrical cable

and/or tubing bundle having one or more electrical conductors and/or tubes extending therefrom to provide

a barrier to the flow of gas or vapors therethrough. The sleeve contains a cavity at one end thereof that when

the sleeve is in an expanded state is adapted to receive the end of the bundle. The sleeve contains one or more

internal channels at the opposite end thereof that are separated from each other by walls that are directly or

indirectly integrally related to the wall of the remainder of the sleeve and are adapted to permit the one or

more conductors and/or tubes to extend therethrough from the bundle end in the cavity.