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  1. M

    4" internal soil stack

    My property was built in 1994, both the internal soil stacks are 4" (102mm). I need a replacement Air Admittance Valve. Does anyone know a manufacturer that makes them this size? The only ones I can find, including the one I bought, are 110mm. I bought a 100mm / 110mm adaptator but that...
  2. M

    Flexible soil stack

    The 4" vertical soil pipe in my ensuite terminates with an air admittance valve below the toilet cistern. I'd like to extend the soil pipe into the loft space and either finish in the loft with an air admittance valve or possibly vent externally. Can I extend it using a flexible pipe or does...
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