For horizontal or vertical installation in parapet ducts with T-slot, KR 50 for OBO/Bettermann ISS133, KR 50 for TEHALIT System FB, KR 55 for TEHALIT System BR, on-site assembly of fiber optic connectors, use of pre-assembled cables, splicing of connector pigtails, compliance with the minimum bending radii for fiber optic cables according to TIA/EIA 568 A (greater than 30 mm) on the input and output side, direction-independent cable entry with cable tie strain relief, variants: 55 mm, 50 mm