Where are you located? This sounds like a wall-hung tank
with a metallic tube (pipe) connecting the tank outlet
to the bowl "spud".
If you're in UK, post to: UK.D-I-Y
Thanks for your reply.
I am staying in Malaysia.
The pipe connecting the tank outlet to the bowl is not metallic but
There is also a thick rubber glove-like cover which holds this pipe to
the bowl. Most times, this rubber cover is 'pushed out' by the water
pressue when I flush the toilet.
I hope this gives you a better picture of what the problem is.
I would appreciate your advice.