I have fitted a new sink that is lower than the original one so the
inlet to the main waste, down pipe is too high.
The house was built about 20 years ago and I expected all the piping
to be plastic but it is a galvanised metal and rings like iron. I
have a strap boss that I was hoping to fit but first I have to make a
55mm hole. Is there a tool? Can it be done? How?
Don't want to be a pain but I looked on the site you suggested at
http://www.bes.ltd.uk but can't find the tool. I searched for 'hole,'
'saw' and various combinations of other words without success :-(
I have a similar problem, although I have to couple a copper pipe from
a Saniflow to the cast iron pipe and cannot get a strap around the
So, does anyone know how you would go about coupling a 22mm (or
32mm if my route is > 12m - touch and go) copper waste pipe from a
Saniflow to an old cast iron soil stack. As it stands I would have to
drill a suitable hole in the stack, then couple it some how. This is
the bit I'm unsure about.
The only complication is that I only have access to one 'side' of the
stack. There has been an extension on the house and the soil pipe now
runs down partially behind the wall of the extension:
house wall ______|O <---soil stack (I can get to this side of it)
My rudimentary diagram does not show that the 3 walls that surround
the stack are very tight against it and all cemmented up to the pipe,
so I don't think I could get any strap type fitting round the pipe.
Really appreciate any advise on this. Thanks in advance.
the way of positive comment and so left you to it.
I think the only way to make a reliable connection is to use a boss. If
that is the case, then you need to make room to fit one, even if that
means hiring an SDS blaster to make room to fit one. You can make good
the render/brickwork after the even.
Two other points, you don't really want a right angle bend in the pipe
just before joining the stack so maybe that means working from inside
the house & removing bricks until you can make a straight connection to
the stack. Also, why copper, it's not the normal way to do things so as
a result there won't be fittings to do the job. Suggest you do it in
waste pipe of the appropriate size and if you need to make a copper to
waste pipe joint, do it near the start & away from the already difficult
brickwork & boss muddle.
Hope that helps, but there may be better solutions, if I was to see the
problem & perhaps take a step back I might end up with a different slant
and a better one.
Thanks very much for all your comments Fred, they were useful. I have
a few more questions in response
OK I'll have to have a good look to see whether this is feasible in
the space I have to work with - it's very tight.
Why is that? I understand that bends in general should be swept bends
and not right angle, but what's the significance of proximity to the
This could be interesting - I have a fitted kitchen on the other side
of the wall! The soil stack may just coincide with the Dishwasher bay
I understand that using 22mm copper is the best way of plumbing
Saniflow waste (as it is more robust than solvent-weld plastic). I
don't think it's that uncommon, therefore I assumed that someone may
have come across the same problem
- joining 22mm copper to cast iron stack
Are there fittings to join 22mm copper to say 40mm plastic waste?
bend and had also assumed that you would be taking it straight through
the wall just before you bent it into the stack. That would make for a join
near impossible to dismantle and assess for blockage. Best to make
potential problem areas accessible for service.
type or a toilet? Also, I would have thought that plastic would have a
smoother interface at the joints, less risk of burrs/blockage aaaaand
serviceability again, a few non solvent joints in the plastic would let you
dismantle if required.
overflow pipe) that may suit, but I certainly wouldn't trust such a joint to
any kind of pressure. Perhaps if it was the joint at the stack then it would
be ok, so that would be boss, solvent adaptor to 40mm then 40/21.5
rubber reducer but def don't make it concealed anywhere
Again, hope that helps . . . . some
A sounding board for ideas is a good thing atleast. May be prompt
someone else to post to the thread, so we all pool knowledge/common
sense - what this is all about eh?
Fair enough. May be fitting an equal tee with an acces plug for
rodding between boss onto soil pipe and swept bend through wall would
be advisable. Avoiding 90 deg bends and allowing access
I have to agree on this, but think this reason is one of robustness.
Need to do some more probing here eg talking to my local Saniflow
stockist etc. It is for a toilet pump.
Since using copper for Saniflow waste does appear to be recommended
[from Saniflow website "All pipework should be either copper or CPVC
conforming to BS7291. Do not use flexible or push-fit pipework. " ],
there must be a recomended methdo of connection to the stack...?
d'you reckon? IMHO, not sure there'd be much in it myself...
Personally dont like the idea of having any push-fit joins for a
Saniflow - certainly not inside the house anyway. May be a good
argument for solvent plastic is than you *can* fit occasional equal
tee and access plugs along the route to allow for rodding as I have
commented above. I suppose you could do the same with a compression
fitting/speedfit stop end on copper
Quite! 10 bar I think the motor runs at!
Could insert such an adapter fitting after the swept solvent bend,
down to copper, with the copper running at 45 deg though the wall and
just emerging to make the adapter ie potentially dodgy connection
*outside*. [There must be a better way of doing this....?]
Yes thanks very much - has got me thinking at the very least!
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