1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Discuss Modifying waste plumbing in a kitchen remodel in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. TRodgers

    TRodgers New Member

    I've been doing a remodel of my downstairs and have got to needing to plumb in for the sink, dishwasher and washing machine.

    There is an internal soil stack in the corner of the room which I can plumb into but the old appliances were plumbed into a combined trap under the sink which was just connected with some 40mm pipe straight into the open end of this drain in the floor. Obviously I want to do this more correctly.

    Can I make a little mini stack of
    and cap or something like this https://www.screwfix.com/p/floplast-ax110-black-air-admittance-valve-black/35001 on top to run everything into separately under the sink?

    or am I just better running some 50mm pipe along the wall into a boss in the stack in the corner?





  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    • Like Like x 1
    • Agree Agree x 1
  3. TRodgers

    TRodgers New Member

    And just route everything through some 40mm pipe through it?

    Would you use one of the combined sink and appliance traps or split things off?
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!


    Depends just a washing machine/ dish then combined trap will do

    Dis and washing split
Similar Threads - Modifying waste plumbing Forum Date
Modifying a chimney cowell? Gas Safe Registered Plumbers Only Jul 8, 2019
cast iron waste issue Plumbing Forum Today at 6:14 PM