All HL-products listed on this website are subject to regular warranty according to the Austrian Product Liability Code if properly installed by qualified specialists.
All HL-products are subject to permanent factory inspections. HL-products with test marks are subject to regular official quality inspections and conform to the particular standards (ÖNORM).
The feasibility of welding of HL-PE-drains with all PE-pipe ranges in the market is certified by the Austrian Plastics Institute.