... , S4, S5 of pipe pressure level 5 series. Nominal diameter from 20 to 160 mm, etc DuoZhong 50 specifications. Hot ... and cold water pipes with the points, S4, S5 for cold water pipe, series ... more than 40 °C the fluid temperature, S2 to S3.2 series for normal use hot water pipe, tube, the ... industrial, agricultural tube. PPR hot and cold water pipe series