The reducing tees are manufactured from PE100 high-density polyethylene compound, black in color. The PE100 compound is a homogeneous mixture of polyethylene, antioxidants, pigments, and UV radiation stabilizers. The PE100 raw material complies with standards SR ISO 4427-1 and SR EN 12201-1. Manufacturing The reducing tees consist of a tee made from segments to which one or more reducers have been welded. Reference standard SR EN 12201-3: Plastics piping systems for water supply, and for drainage and sewerage under pressure. Polyethylene (PE). Part 3 Fittings. Use in drinking water supply networks with operating pressure PN 8 bar, installed underground. Service life is 50 years, corresponding to an operating temperature of 20°C and a working pressure equal to or less than the PN for which the fitting was manufactured. Joining method – by butt welding with fittings/pipes with the same SDR. – by electrofusion. Approvals Technical approval and agreement for use in construction in Romania. Sanitary approval for use with drinking water, issued by INSP Bucharest.