... DuoZhong 50 specifications. Hot and cold water pipes with the points, S4, S5 for cold water pipe, series of normal use ... temperature, S2 to S3.2 series for normal use hot water pipe, tube, the fluid temperature more than 70 °C, ... water, drinking water pipe; Beverage, liquid drug production conveying system; Compressed air tube; Other industrial, agricultural tube. PPR hot and cold water pipe series ...