Vahid industrial group has started its activities since 1995 with manufacturing polypropylene pipes for use in hot and cold water plumbing system of buildings. At present، this group consists of three companies that are located in Mazandaran industrial park of Shoormast Savad Kooh and Shiraz industrial park. Hamid company of pipe manufacturing and fitting، one of the subsets of this industrial group، is the manufacturer of new generation of triple layer push fit pipes that are used in sewer system inside buildings and sewer extension kits using nanotechnology، with the commercial name of MURI SILENT PIPE. This product is the combination of the technology baught from Germany and two research projects of this company with accredited universities of the country. MURI SILENT PIPE piping system is the new generation of three layered push fit pipes that are used in sewer system inside buildings and also has higher cyclic resistance compared to its previous generation (single layer push fit pipes- HD) and is designed for use in sewer branching outside buildings.