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

Discuss What waste to use for basin and vanity in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Paul johnson

    Paul johnson New Member

    I'm fitting and basin and vanity what waste is best to use P trap or Bottle trap.
    Thank you Paul
     
  2. chris watkins

    chris watkins Plumber

    Bottle trap, 1.1/4" with 75mm water seal. Short piece of 32mm pipe then increase to 40mm into a bend or tee. That way minimal risk of siphonage.
     
  3. Ben-gee

    Ben-gee Plumber

    Personally prefer p-traps, deep seal bottles are usually bulky and flow rate is slightly worse too.

    I have found in some units with semi-recessed basin the bottle traps foul on the unit fascia, as the trap is symmetrical they come forward too far. The p-trap can be arranged to go fully backwards .

    I do use the shallow seal bottle traps sometimes if it’s going into hopper/gulley as they are quite neat.
     
  4. Stigster

    Stigster Plumber

  5. chris watkins

    chris watkins Plumber

    It will siphon the water out every time the basin is used thats what I know,
    but Paul is fitting a vanity basin not a pedestal, so he won't have to worry about space.
     
  6. Stigster

    Stigster Plumber

    I do a trap seal loss task with our students and do see that they are more easily syphoned but that is with my horrid "worst case scenario" setup where I have three basins connected to one 1 1/4" pipe on an excessively long run. Then the pedestal traps fail the tests where a bottle trap does not, not that I would use a bottle trap on a basin generally. A P trap also loses its seal in these tests.

    When I set it all up properly with a correctly sized waste pipe, proper fall and distance to an open vented stack, the pedestal traps do not fail.

    I suppose we have to assume that the trap could be installed in a badly designed system and then I am sure syphoning will be a problem. I do wholly accept that the pedestal trap is the most sensitive to syphonic action for sure though.
     
  7. chris watkins

    chris watkins Plumber

    Are but your traps & wastes are all clean & not been reduces in bore by years of usage, thats the problem with doing things in colleges instead of real life.
     
  8. Paul johnson

    Paul johnson New Member

     
  9. Paul johnson

    Paul johnson New Member

    Thank you all for your reply's much appreciated.
     
  10. Stigster

    Stigster Plumber

    Yes they are clean, apart from when I put sand or other things in them to create blockages but you do have a valid point there. College is just a starting point and nothing beats real life experience I totally agree.

    I have to say I've not come across many if any at all in service as the good old fashioned P trap does a fine job in the vast majority of situations.
     
  11. chris watkins

    chris watkins Plumber

    I am a P trap man myself, with exception of bottles on basins if you must. ;)
     
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Small bottle for me as sometimes they hit the shelves / draws
     
  13. Stigster

    Stigster Plumber

    The bottle trap is easy for the customer to open and clean at least. Also, in my tests the bottle traps are almost impossible to syphon to the point of seal loss too even when I'm trying to make it do that.
     
Loading...
Similar Threads - waste basin vanity Forum Date
Basin waste/overflow issue? Bathrooms, Showers and Wetrooms Jul 3, 2019
Dishwasher, Sink, Washing Machine to the same waste outlet? Plumbing Forum Monday at 1:18 PM