... S3.2, S4, S5. There are more than 50 specifications with nominal diameter from 20 mm to 160mm. S4 and ... series are of cold water pipes, the liquid temperature with normal use should be lessthan 40°C, S2, ... are of hot water pipes, the liquid temperature with normal use should be less than 70°C. ... The working life is approximately 50 years.Feature:1. Sanitary & non-toxic;2. Corrosion ...