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Can You Use Grey Pipe Underground? [Solved]
Technically, a soil pipe (i.e. a black, white, or grey 110mm pipe) should only be installed above ground. Once the soil pipework goes below ground, it should be connected to a terracotta foul water drainage pipe.
How Polybutylene Piping (Grey Pipes) Caused Plumbing Leaks, Mold Inside Wall
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