Two Cistern Pipes

Discussion in 'Plumbers' Talk' started by MrPoopyPants, May 26, 2023.

  1. MrPoopyPants

    MrPoopyPants New Member

    I am replacing my toilet and cistern next week, the current cistern has a 15mm pipe and a 22mm pipe. The 15mm is the inlet coming off the mains but what is the 22mm pipe for? It goes off into the wall. Would that be an overflow?
  2. andy48

    andy48 Screwfix Select

    Yes, overflow.
  3. qwas123

    qwas123 Screwfix Select

    Modern cisterns come with internal overflows built-in - the external overflow pipe is redundant
  4. MrPoopyPants

    MrPoopyPants New Member

    Great, thank you

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