Reduced tees are made from black, high-density polyethylene compound, PE100. PE100 compound is a homogeneous blend of polyethylene, antioxidants, pigments, and UV stabilizers. The PE100 raw material complies with SR ISO 4427-1 and SR EN 12201-1. Manufacturing: Reduced tees are obtained by welding a reducer/set of reducers directly onto the large-diameter pipe (see PNG sketch). Reference standard: SR EN 12201-3: Plastics piping systems for water supply, service connections and pressurised drainage and sewerage—Polyethylene (PE). Part 3: Fittings. Use in drinking water supply networks with an operating pressure of PN 9.6 bar, installed buried in the ground. Service life is 50 years, corresponding to a use temperature of 20°C and a working pressure equal to or lower than the PN for which the fitting was manufactured. Joining method – by butt fusion welding with fittings/pipes of the same SDR. – by electrofusion.