Fitting new toilet Syphon

[tellytv]

Hi,
I need to fit a new toilet Syphon but not sure how, the one i've got now comes apart in 2, but the new one is joint together, i don't know how to get the long pipe out see pic no:6 below:

this is the picture before i took the other part off

I need to know how to fit a new one, could someone please type instructions and anything that has to come apart i've wrote numbers to the parts, does the whole thing have to come off the wall?

Thanks for any help.

 

[swbjackson]

Why do you need to fit a new syphon? If it's not flushing change the diaphragm.