Runs get extended, and damaged sections get replaced. Both jobs need a 20mm PVC coupling that seats square and holds under pressure. Pressure class PN 10. It cements into the pipe socket with solvent. 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. It belongs on cold-water distribution — housing, commercial buildings and light industrial work.
