Everything else in a plumbing system exists to connect pipe to pipe. This is the 20mm PVC pipe itself. Drainage duty — soil stacks, waste branches and rainwater runs. Rigid PVC does not corrode, rust or scale. A buried run or a boxed-in riser behaves the same in year ten as on the day it was commissioned, which is why it dominates cold-water distribution. PN 10 working pressure; solvent-socket connection.
