Joining different diameter pipes

ailuro2

I agree with keystone, they get it all the time, plumbers merchants are the place to go, they have EVERY size, not just sizes for newer houses.;)

gas4you

Probably better off to go to your local draincenter. They will hold more stock than general plumbers merchants. Standard sizes are 32mm, 40mm, then 50mm.

I would cut a bit off your old pipe and take it with you.

Sink drains should always be a minimum of 40mm, basins in 32mm.

1984ReturnsForReal_2

mikey72 wrote: »

No it won't.
Won't even see it if it's done neatly.

Yes it will.


You cant have a larger down pipe (female) feeding onto a smaller one (male) without welding it.

& lets not get into the effects of direct sunlight & temperature on silicone.

mikey72

Course you can, and you must be using really cheap silicone if it's not uv stable.

1984ReturnsForReal_2

mikey72 wrote: »

Course you can, and you must be using really cheap silicone if it's not uv stable.

What about mold stable?

Or frost stable?


Or 75 degree heat all day stable?


How much does external drainpipe flex throughout the day/night?

:rotfl:


And as your way means the silicone would be inside which is where the seal is it wouldn't need to be UV stable, it would just need to survive the above & thats without the water running into the joint you made & pulling it apart in the winter when it freezes..


I wouldn't do it. I would do a proper job.

baby-mechanic

Got myself to a plumbers merchant, and now have a slightly bulky connection, but no leak.

Thanks for the ideas, and the ensuing discussions.

mikey72

1984ReturnsForReal wrote: »

What about mold stable?

Or frost stable?


Or 75 degree heat all day stable?


How much does external drainpipe flex throughout the day/night?

:rotfl:


And as your way means the silicone would be inside which is where the seal is it wouldn't need to be UV stable, it would just need to survive the above & thats without the water running into the joint you made & pulling it apart in the winter when it freezes..


I wouldn't do it. I would do a proper job.

I didn't like to point that out to you, after you thought daylight would damage it.