Ostendorf Kunststoffe. HT-Safe PP. Waste pipe with triple patented seal that simplifies installation, a PP-H formula that meets DIN 4102 (fire class B1) and DIN EN 1451-1. RAL colour 7043. German quality with 25-year guarantee. Application: waste pipes for buildings such as: waste water, rain water, and ventilation (see also fields of application: DIN 1986-4). Marking of pipes and fittings: permanent marking with manufacturer label, nominal diameter and standard (DIN EN 1451-1) + date of manufacture, material, building material class (fire behaviour). (Connectors contain information regarding angle degrees).