Millennium Lockin' Pocket™ Inter-Locking Flashing System is a pre-fabricated inter-locking pocket that is easily assembled on- site and filled with fast setting, solvent free, Millennium Hurricane Force® Universal Sealer that becomes waterproof within minutes of application. Millennium Lockin' Pockets™ are available in different packaging options. The pre-fabricated pockets simply connect with tongue and groove joints and are composed of a high strength, flexible polyurethane elastomer. All pieces are easily joined bya patent pending locking system to create a pocket of desired size.