... .2 have S2, 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 ... 40 °C the fluid temperature, S2 to S3.2 series for normal use hot water pipe, tube, the fluid temperature more than ...