Flush pipe seal leaking

[Fusion]

Hi all,
New to this forum and new to plumbing. Only just passed Level One plumbing.
I am having to go back and look at a leak from the back of a WC. The flush pipe is chrome and I have replaced the flush pipe concertina seal.
The seal seems to being pushed out of the WC when flushing. The size of the seal seem correct. Any solutions ????
The seal was from Screwfix, but had good reviews.

 

[ShaunCorbs]

Did the seal fit tight around the flush pipe ?

 

[Fusion]

Hi
Yes it was a snug fit. Had to use a little soap to help it along the pipe. It felt snug going into the pan too. When I tested it, I noticed the seal had moved a small amount. The WC is fixed firm to the ground, so no movement there. It seems to be the force of water

 

[ShaunCorbs]

Common issue with the force of the flush is it clipped / can’t move out eg the flush pipe ?

 

[Ben-gee]

Clean all the soap off and wipe pipe and seal with alcohol wipe.
Then assemble dry and hopefully stop it happening. Plastic flush pipe works better - but I know customers often prefer chrome.

 

[Fusion]

Common issue with the force of the flush is it clipped / can’t move out eg the flush pipe ?

Hi
No it’s not clipped. I assume you mean the pipe? It’s not clipped to the wall.

 

[Fusion]

Clean all the soap off and wipe pipe and seal with alcohol wipe.
Then assemble dry and hopefully stop it happening. Plastic flush pipe works better - but I know customers often prefer chrome.

I will give it a try. Could I apply a leak sealant around the seal?

 

[ShaunCorbs]

Hi
No it’s not clipped. I assume you mean the pipe? It’s not clipped to the wall.

Needs to be clipped / something wedged behind to stop it pulling out you could try a jepp cone

 

[snowhead]

Is the flush pipe too far into the pan, reducing the space for the water to come out of it?

 

[PETE 123]

cistern at angle pulling pipe out?