Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss Pan Waste Connector slightly up hill in the Sanitary Ware area at

  1. NiccoloC

    NiccoloC New Member

    The old toilet has been changed for a vanity unit.

    There is a soil pipe adapter, very well fitted onto the old cast iron pipe which brings the diameter up to modern standards. This has a deep rubber connector aperture.

    The soil pipe attaches about 2cm higher than the toilet outflow which makes it slightly uphill.

    When fitted there was a slow leak from the standing water both at the connection to the toilet and at the connection to the adapter.

    The toilet connection is unglazed, due to it being a vanity unit style.

    I have been advised that upgrading the leaky Viva Slinky-Fit Flexible Pan Connector 200mm to a Macfit Flexible WC Connector Straight 160mm should prevent the leak at the toilet output as the Mac has a much tighter seal there. I am concerned about the connection to the soil pipe adapter.

    It is unsuitable to raise the new toilet on a plinth.

    Any technical advice?
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    As the old adage goes sh** rolls down hill. Really needs sorting
  3. rpm

    rpm Trusted Plumber

    Flexiable connectors are never a good idea in my book, is the other one you mentioned a solid connector and yes you can use a plinth.
  4. NiccoloC

    NiccoloC New Member

    Thank you.
    A plinth may ruin the look of the modern system, but may be only way to go.

    Flexi connector is due to offset in height and as it is vanity unit. The connector can be observed connecting to both toilet and the soil pipe adaptor before being pushed into place.

    A rigid connector may not line up exactly and not sure if I can get one of the correct length to fully insert into the adapter.
  5. JCplumb

    JCplumb Plumber

    If you cut your plinth to the exact footprint of the pan, i.e. put the pan on the piece of wood and draw round the bottom - you can then paint it up and you'll not notice it unless you're looking for it.
    • Like Like x 2
  6. Stigster

    Stigster Plumber

    Whatever you do, it must flow downhill.
    • Winner Winner x 1
  7. Ben-gee

    Ben-gee Plumber Top Contributor!!

    Any reason you can’t do it properly and alter the soil stack?
  8. Steve weightman

    Steve weightman GSR

    Not to much hassle to lower the outlet with it being behind the unit it won't have to be tiled etc the same as before.
  9. Ben-gee

    Ben-gee Plumber Top Contributor!!

    Steve it’s a cast iron stack, I think that is usually classed as hassle! However why bodge it? Just do it properly - once.
  10. Steve weightman

    Steve weightman GSR

    It is possible depending on the branch to put plastic 4 inch into cast stack and various fittings get back onto the pan
  11. NiccoloC

    NiccoloC New Member

    It is cast iron and going through brick wall with cavity insulation and external render on the 1st floor.
    Inside has been heavily cemented in.
  12. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Plinth required then
    • Like Like x 1
  13. NiccoloC

    NiccoloC New Member

    Going to try plinth 1st.
    Measured and 22mm plinth is sufficient to raise toilet outlet above connection to stack.
    If this does not work it can be undone without affecting anything else.
    Thanks for all the advice.

    Photo is toilet lined up on plinth.

  14. Timmy D

    Timmy D New Member

    Either raising the pan or knocking out the cast.
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    How much of the cast is out the wall ?
Similar Threads - Waste Connector slightly Forum Date
vertical waste pipe is 235mm from wall, need a WC to accommodate this Sanitary Ware Friday at 4:04 PM
Options for tidying up external waste pipes Fittings & Pipes Jun 5, 2019