The T-joints are manufactured from black PE100 high-density polyethylene compound. The PE100 compound is a homogeneous mixture of polyethylene, antioxidants, pigments, and UV radiation stabilizers. The PE100 raw material complies with SR ISO 4427-1 and SR EN 12201-1 standards. Manufacturing: Injection-molded fittings. Reference standard SR EN 12201-3: Plastic piping systems for water supply, service connections, and pressure drainage systems. Polyethylene (PE). Part 3: Fittings. For use in potable water supply networks with an operating pressure of PN 16 bar, installed underground. The 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 fusion welding with fittings/pipes of the same SDR. – by electrofusion.