H-BAU Technik PENTAFLEX® pipe lead-throughs are used wherever watertight component penetrations (white tank construction) are required to feed through supply and disposal lines. PENTAFLEX® pipe lead-throughs can be used in both in-situ concrete construction and in prefabricated components. These products are both versatile and reliable, even when used in walls with interior insulation. We also carry a wide product range for watertight floor lead-throughs and roof drains.