... diameter from 20 to 160 mm, etc DuoZhong 50 specifications. Hot and cold water pipes with the points, S4, S5 for cold ... fluid temperature, S2 to S3.2 series for normal use hot water pipe, tube, the fluid temperature more than 70 °C, ... Pure water, drinking water pipe; Beverage, liquid drug production conveying system; Compressed air tube; Other industrial, agricultural tube. PPR hot and cold water pipe ...