SIGMA-Li includes logged fittings and connectors with pp within the diameters of FI 16 to FI 90, pressure pipes from Polish Standard 10 to 20 in diameters FI 16 to FI 90 and tools to pp. System SIGMA-Li is applicable in central heating system, installations of hot and cold water and technological installations in industry. Modern machine park and high quality of raw materials enabled sellin SIGMA-Li system is sold in the whole country and also abroad.