What pipe is this and how do I join to it?

[GB]

I want to change the basin in the bathroom. It was installed 50 years
ago, and the main problem I anticipate is joining up the new basin waste
to the old waste.

The old waste is plastic, appears to be push fit, and has an outside
diameter of approx 34mm. Any idea what sort of connector I am going to
need, please?

Is this going to be excessively brittle and split if I try and cut it?

Unfortunately the waste goes vertically down from the basin, then
disappears under the bathroom floor. If it splits, I'll have to run a
new waste down the outside of the building.

[Harry Bloomfield Esq]

The old waste is plastic, appears to be push fit, and has an outside diameter
of approx 34mm.

34mm is a standard push-fit size. If the old fitting is well stuck on
the pipe, just cut through the fitting (angle grinder/dremel), to avoid
damaging the pipe.

[Colin Bignell]

Post by GB
I want to change the basin in the bathroom. It was installed 50 years
ago, and the main problem I anticipate is joining up the new basin waste
to the old waste.
The old waste is plastic, appears to be push fit, and has an outside
diameter of approx 34mm.  Any idea what sort of connector I am going to
need, please?

Push fit for 32mm pipe, by the sounds of it. The 32mm dimension is the
internal diameter, so the OD is about a couple of millimetres larger.

Post by GB
Is this going to be excessively brittle and split if I try and cut it?
Unfortunately the waste goes vertically down from the basin, then
disappears under the bathroom floor. If it splits, I'll have to run a
new waste down the outside of the building.

[Andy Burns]

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

McAlpine "multifit" provide a reasonable amount of accommodation for variations

<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fittings>

[GB]

Post by Andy Burns

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

McAlpine "multifit" provide a reasonable amount of accommodation for variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fittings>

Thanks all. I'll give it a go.

My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

[Tim Lamb]

In message <t8suui$vdk$***@dont-email.me>, GB <***@microsoft.com>
writes

Post by GB

Post by Andy Burns

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

McAlpine "multifit" provide a reasonable amount of accommodation for variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

[GB]

Post by Tim Lamb
writes

Post by GB

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

 McAlpine "multifit" provide a reasonable amount of accommodation for
variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

The cold is mains and the hot is gravity, so I was going to get
something pretty simple, like this:

https://www.wickes.co.uk/Wickes-Trade-Chrome-Basin-Mixer-Tap/p/161591

[Tim Lamb]

In message <t8t24q$2ch$***@dont-email.me>, GB <***@microsoft.com>
writes

Post by GB

Post by Tim Lamb

Post by GB

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

 McAlpine "multifit" provide a reasonable amount of accommodation
for variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as
to fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

The cold is mains and the hot is gravity, so I was going to get
https://www.wickes.co.uk/Wickes-Trade-Chrome-Basin-Mixer-Tap/p/161591

Claims to be OK on low pressure!

There have been several threads in here where problems with gravity fed
mixer taps have been discussed.

I have no direct experience to offer but would avoid small bore,
flexible final couplings if possible.

[Andy Burns]

Post by Tim Lamb

Post by GB
https://www.wickes.co.uk/Wickes-Trade-Chrome-Basin-Mixer-Tap/p/161591

Claims to be OK on low pressure!
There have been several threads in here where problems with gravity fed mixer
taps have been discussed.

If you can find one where the hot and cold don't mix within the body of the tap,
but stay in concentric pipes all the way to the end of the spout. You can
certainly get tall kitchen taps like that, bathroom basin ones I'm struggling to
see any.

[Theo]

Post by Andy Burns
If you can find one where the hot and cold don't mix within the body of the tap,
but stay in concentric pipes all the way to the end of the spout. You can
certainly get tall kitchen taps like that, bathroom basin ones I'm struggling to
see any.

The term is 'dual flow', eg:
https://www.amazon.co.uk/Bristan-VAC-DFBAS-MT-Pop-Up/dp/B00B9J2JNM

[GB]

Post by Theo

Post by Andy Burns
If you can find one where the hot and cold don't mix within the body of the tap,
but stay in concentric pipes all the way to the end of the spout. You can
certainly get tall kitchen taps like that, bathroom basin ones I'm struggling to
see any.

https://www.amazon.co.uk/Bristan-VAC-DFBAS-MT-Pop-Up/dp/B00B9J2JNM

Thank you, I'd forgotten the term.

[Roger Mills]

Post by Andy Burns

Post by Tim Lamb

Post by GB
https://www.wickes.co.uk/Wickes-Trade-Chrome-Basin-Mixer-Tap/p/161591

Claims to be OK on low pressure!
There have been several threads in here where problems with gravity
fed mixer taps have been discussed.

If you can find one where the hot and cold don't mix within the body of
the tap, but stay in concentric pipes all the way to the end of the
spout.  You can certainly get tall kitchen taps like that, bathroom
basin ones I'm struggling to see any.

Yes, indeed. If they 'mix' within the body of the tap, forget it! The
high pressure cold will stop the low pressure hot dead in its tracks -
and may even reverse it. You would then have to operate the taps one at
a time - which would defeat the purpose of having a mixer!

Beware of taps which claim to work on high or low pressure. By 'low
pressure' they often mean low pressure mains at ~ 1 bar - not gravity
feed at ~ 0.2 bar. I ended up having a mammoth dispute with Wickes over
this very thing.

[Dave Plowman (News)]

Post by Tim Lamb
writes

Post by GB

Post by Andy Burns

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

McAlpine "multifit" provide a reasonable amount of accommodation for variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

I have a mixer on the bathroom basin. Mains cold but gravity hot with the
header tank not that much higher than the bathroom ceiling. The usual
10mm? tails into the mixer. Works just fine. You don't really need maximum
flow and pressure possible for a basin.

[GB]

Post by Dave Plowman (News)

Post by Tim Lamb
writes

Post by GB

Post by Andy Burns

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

McAlpine "multifit" provide a reasonable amount of accommodation for variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

I have a mixer on the bathroom basin. Mains cold but gravity hot with the
header tank not that much higher than the bathroom ceiling. The usual
10mm? tails into the mixer. Works just fine. You don't really need maximum
flow and pressure possible for a basin.

I expect that the cold mains can be tamed just by not turning the tap on
too much. If I don't go for a dual flow tap, I had better install a
check valve on the hot side. Did you bother?

[SteveW]

Post by GB

Post by Dave Plowman (News)

Post by Tim Lamb
writes

Post by GB

Post by Colin Bignell

Any idea what sort of connector I am going to need, please?

Push fit for 32mm pipe, by the sounds of it.

  McAlpine "multifit" provide a reasonable amount of accommodation for
variations
<https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fi
ttings>

Thanks all. I'll give it a go.
My wife thinks I'm barmy, as I only want to change the basin so as to
fit a mixer tap.

Bear in mind the possible low flow issues if your water is gravity fed.

I have a mixer on the bathroom basin. Mains cold but gravity hot with the
header tank not that much higher than the bathroom ceiling. The usual
10mm? tails into the mixer. Works just fine. You don't really need maximum
flow and pressure possible for a basin.

I expect that the cold mains can be tamed just by not turning the tap on
too much.

I just partially closed one of the isolation valves to get a rough
match, as ours is a single lever operated tap, giving full hot to one
side and full-cold the other.

Post by GB
If I don't go for a dual flow tap, I had better install a
check valve on the hot side. Did you bother?

It's not applicable for our. It's a open topped channel for a spout and
the water mixes in the open, not within the tap body.

[John Rumm]

Post by GB
I want to change the basin in the bathroom. It was installed 50 years
ago, and the main problem I anticipate is joining up the new basin waste
to the old waste.
The old waste is plastic, appears to be push fit, and has an outside
diameter of approx 34mm.  Any idea what sort of connector I am going to
need, please?

Sounds like standard push fit 1.25" (note solvent weld 1.25" is a
different diameter!)

However, for easy, just buy a "universal" compression fitting - that
will join to anything that is in the ballpark size.

More info here:

http://wiki.diyfaq.org.uk/index.php/Waste_pipe

Post by GB
Is this going to be excessively brittle and split if I try and cut it?

Probably not - push fit tends to be more "plastic" anyway.

Post by GB
Unfortunately the waste goes vertically down from the basin, then
disappears under the bathroom floor. If it splits, I'll have to run a
new waste down the outside of the building.

--
Cheers,

John.

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