Toilet leaking from cistern connection.

[stuco]

Hi, this is probably a really basic thing, but I'm a complete novice.

Have connected a wall hung toilet to a Grohe rapid frame system. I'm using the connector supplied to connect cistern output to inlet on toilet. It looks like a tube with 3 rubber flanges on one end - sorry, don't know the technical term. Have cut it to size and pushed the flanged end into the back of the loo and the plain end into the frame side - this already has a ruuber o ring seal in.

When I flush the loo I'm getting water pouring from back of loo - not talking the odd drip here! Have flushed loo with a bucket of water and it seems dry so I'm assuming its not leaking from soil connector, but from the actual cistern connection. Although I can't see exactly where water is coming from, because of where its appearing, I'm guessing its from the toilet end of cistern connection.

Are these connections supposed to be sealed in somehow extra?

Thanks in advance.

 

[REDSAW]

no they are a simple push in connection,
make sure the pipe is not pushed too far into the pan.
the flush pipe is to go only the depth of the flush cone (rubber bung).
and dont stress the joint.

 

[MickBrown]

I had a similar problem fitting a concealed cistern toilet, it wasn't wall hung but the pan fitted flush to the framework when fitted. The water didn't gush out but after every flush a pool of water appeared from under the pan. It turned out to be a hairline crack in the pan somewhere just after the rubber bung.

 

[Billy Bob Bob]

i agree with redsaw a crack in the pan is rare more likely sparge pipe in to far or distorted rubber

 

[stuco]

Thanks for the replies. Hoping to get a spare hour or so tomorrow so will have another go. I'll try cutting the pipe a little shorter but is there some way of making sure the pipe fully inserts into the cistern end and doesn't push through into the pan end instead?

 

[REDSAW]

Thanks for the replies. Hoping to get a spare hour or so tomorrow so will have another go. I'll try cutting the pipe a little shorter but is there some way of making sure the pipe fully inserts into the cistern end and doesn't push through into the pan end instead?

yes,!.

its called accurate measurement.

wall to cistern outlet center to toilet pan inlet plus insert.
toilet pan insert center to max hight (less 1'') into syphon tube outlet.
put flush pipe into syphon, dont screw on,
put flush cone into pan inlet,
now lightly screw up cistern nut.
slide flush/p into cone.

 

[stuco]

Hi,

thought I already had...
Don't think I explained it properly - the cistern is part of a concealed Grohe rapid frame, which obviously has to be boxed in before the wc can be mounted. Have done this and this leaves the cistern end (syphon tube?) just ready to have the tube pushed into it. There is no screw or way of clamping this end of the tube to hold it in place, therefore enabling the other end to push into the flush cone the correct amount.

What I can't get straight in my head is that if both ends are push in, what stops the flush pipe sliding more into the toilet cone instead of back into the cistern connection. Is it simply a path of least resistance and the cone is a harder push?

Cheers.

 

[PlumbBobBob]

if there is any movement in the flushpipe when you push the pan back it will just push back against the pressure of the flush cone.

 

[stuco]

Ahh. Cheers, will give it a go.

 

[stuco]

Ok, still having problems! Have tried,

1, Shortening the flush pipe - but when reading back through the posts it sounds as if it is normal for the flush pipe to be able to project further than the flush cone into the loo ?
"make sure the pipe is not pushed too far into the pan.
the flush pipe is to go only the depth of the flush cone "
The bit on the loo is only deep enough to take the flush cone and the pipe could not project any further anyway...

2, A new different bung

3, Siliconing the whole thing in

4, A longer flush pipe (40mm waste off cut) but this was slack enough to allow leaking from the cistern end of things so a bit worried that I'm going to have to stick to grohe supplies.

It still LEAKS!!

Now looking at flexible flush pipes as I'm pretty sure part of the problem is that its not a horizontal line from the rear of loo to frame. Also seen external flush cones. Any thoughts/comments on if these will possibly work or any other suggestions gratefully recieved.