DUOFIL started the production of Polyethylene pipes in the Industrial Unit of Gião (Porto) in 1995 and, since then, has been ... expanding its range of products: PE-Xa, PE-Xb, Multi-layer, PE-RT, PEAD, Plastic Fittings Injection... In 2007, the industrial activity begins in the Pedrógão Grande Unit (Leiria). In July 2020, Duofil changed its name to DUOPIPE SYSTEMS UNIPESSOAL LDA and became part of the AURAY MANAGING Group. The APCER - ISO 9001 Quality Certification recognizes innovation and quality of our products in sanitary facilities, air conditioning, drinking water, gas and drainage. read more