Hexatronic MPB30608/20A (Millennium part 541862) is a 25-piece kit of black IP68 divisible seals for 20 mm duct carrying cable of 9.4 to 12 mm outside diameter, the range typical of larger distribution fiber. The split body lets crews seal around cable already in place, so a duct can be made watertight during a later phase without disturbing the installed span. IP68 performance holds up to prolonged submersion in flooded vaults. Bulk kit packaging suits production work where a single duct bank may need dozens of seals sized to matching HDPE couplers and sweeps.