I have replaced an old "The Original Burlington" cast iron high level
cistern and associated lead flush pipe and toilet in my outdoor loo, but
find that the old overflow wall exit position is now far too high up the
wall for my new low-level cistern.
I wish to connect the new 22mm plastic cistern overflow to a new
32mm wastepipe that I am going to install for a sink, as I don't want to
separate holes in the wall for both unless strictly necessary.
Is there such a thing as an unequal 32/22mm tee available in
plastic, or similar? I can't find anything suitable. I'm not sure if it's
verboten to simply create a junction between a sink waste pipe and a cistern
overflow, or I haven't looked for a suitable junction hard enough. Anybody
IIRC an overflow has to vent in such a way that it causes a nuisance that
prompts you to fix the problem, so you cannot conveniently plumb it away to
waste where the problem would be invisible and go undetected. (Often in
public places you will see the overflow set so that it flows into a basin
and thus can be seen.)
Excellent replies folks! I hadn't thought of using the
flush downpipe as a route for the overflow pipe; it'll
be the most convenient way if I can get an adaptor.
I wouldn't have thought a tundish would be
necessary in this circumstance, as you could see the
water dribbling down the back of the pan. I'm sure
there's a regulation somewhere saying this isn't good
enough, but I can't make use of the tundish since the
cistern is boxed in.
The reason I don't want to send the overflow pipe
out through the wall is that the available area is small and
congested with a tap, combi overpressure vent and a
32mm waste pipe already; it's beginning to look like the
engine room of the Titanic in that area of my wall, on the
Every time I find a good engineering solution some
non-critical reg makes my life difficult! I shall
probably fit the tundish and make a mental note to look
in at it through the lid of the boxed off section once in a while!
I'm just about to do the same job Andy. I found a thing called a Time-Saver
Overflow Kit made by :
Bergin Products Ltd, 110/124 The Broadway, West Hendon
London NW9 7AA Tel: 020 8202 3737 Fax: 020 8202 6565
(can't find a website)
I bought mine in Woodley & Hart at Amersham, Bucks.
It's a bit like a strap boss (except it's aluminium). It's in 2 sections - you
saddle them round the flush pipe where you want the connection and tighten the
bolts up, then cut a hole in the pipe through the boss using a 22mm hole cutter.
Finally you assemble the compression ring and rubber olive and fit the 22mm
plastic overflow pipe into the boss just like a mini sink waste pipe. (I hope
that makes sense, I'd do a pic if I could)
If you can't get hold of one let me know (remove no & spam)
I found that the only thing I could get hold of over-the-counter was
a kit rather as you describe; a pair of clamps or saddles ( in plastic )
with rubber seals that tighten against the overlow tube when screwed
together, with a 19-23mm compression fitting coming of one of the
saddles. I came across three versions of the same type of fitting, one
had a 22mm hole-cutter included!
Of course, it went a bit wrong as when I got it home the instructions
said that the arrangement must be fitted with the 22mm compression
fitting thingy vertical, impossible with the geometry I have, so I smeared
some evil smelling sealant stuff over the rubber seals and fitted it
( i.e. attached to the vertical section of the flush pipe ). I expect I've
committed some cardinal sin by doing so and the sky will fall on my head,
but it appears to work just fine. I fitted a tundish thingy as well as a nod
towards the regulations.
BTW, is it really true that I need to have a man from the planning
people come and watch me do a pressure test if I fit a new push-fit waste
pipe in my outside toilet? It has an admirable aim as rules go, but I just
think that those dutiful enough to call the planning officer up to watch
test will do the job properly anyway, whilst those who do a bad job won't
even consider having someone looking over their shoulder and telling them
they have to do it again!!
On Wed, 10 Dec 2003 21:42:22 +0000, andrewpreece wrote:
Whilst the fittings are readily available you would be better off drilling
through the wall at low level to produce an external visible over flow pipe.
Also many modern cistrns now don't have any external over flow pipe the
overflow happens internally through the syphon into the bowl.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
All of the newer flap valves, that I've seen, that go with the new 6L flush
cisterns seem to be like that.
Also the Flowmaster flap valve adaptor for older cisterns obliviates the
need for an overflow pipe.
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