The BLACK-JACK 25-Pair and BLACK-JACKPlus 50-Pair Closure are filled with POLY-BEETMSealant to provide long-term protection for direct buried cable splices (individual or modular connection).The sealant forms a barrier to protect splices against the harsh elements of nature. The closures incorporate a water-block system that consists of a soft cable grommet and a gasket seam seal. The soft grommet effectively seals around cables within the accepted diameter range. The gasket seals the halves of the closure to further ensure protection.