Toilet Flush Connection Problems

[Brashbaz]

Hi Guys.
I am installing a new bathroom with the help of a young plumber.
The toilet is a back to wall with a concealed cistern. The Box it came in say's "VAIL". My problem is the flush connection seems too small. It measures approx 50mm dia tapering down to approx less than 40mm dia. The Rubber Bush just pops out!!
The flush pipe supplied is 50mm dia (for connection to the cistern) and 47 ish dia for connection to the Bowl.
I spent yesterday touring the diy sheds for a smaller bush and a different flush pipe, with no luck.
What am I missing.

Regards Baz

 

[WHPES]

Would a rubber bush for a soil stack boss fit? I have used them in the past for such jobs.

 

[Brashbaz]

Could do. I am off to our local Plumb Center this afternoon to have a look. Ta Baz.

Hi Guys.
I have been to Wicks, B&Q, Focus, City Plumbing & Plumb Center. And have drawn a blank!!.
Just had an email from the supplier.......T"he TC concealed cistern has standard fittings known as “common parts”. You always will require adapting the WC units to suit. In some instances you may require to fix a timber baton to the rear of the unit and then fix the cistern to the timber. We sell hundreds of these products and have never come across a problem with the parts not fitting."
What am I missing?

Baz.

 

[WHPES]

I remember having a devil of a job trying to sort a leaking flush pipe on a concealed system last year. it was a kind of push fit into the cistern and I couldn't stop it dripping, and I couldn't get at the base of the cistern without ripping apart the bathroom. Managed to get it to seal with an adhesive sealant.