Concealed cistern

[siimon]

I'm fitting a new bathroom, and the toilet will have a concealed cistern. I've built up a timber frame for the cistern to sit in and I'm trying to figure out the order to do things.

The Plan:

1) Fit the toilet and make sure it works without leaks.
2) Remove toilet
3) Cut holes in tile backer board for flush button, an access panel just above the pan (to check for leaks), flush pipe and soil.
4) Fit flush pipe and L-shaped pan connector
5) Screw on backer board, tile and grout
6) Push toilet into place and secure it.

My problem is this flush pipe. There are two rubber 'O' rings on the spigot at the bottom of the cistern, and the flush pipe just slides onto this. There is no mention of support for the flush pipe in the instructions. There is no supplied bracket to keep it up.

It looks as though I have to support the flush pipe so it doesn't budge, both in the horizontal direction (when I push the toilet onto it), or in the vertical direction (so it doesn't disengage from the cistern when flushing). The pan connector seems to also need some support for when the toilet is pushed back onto it.

Who came up with the idea for a push-fit flush pipe? :cuss:. Also, just for reference, if this is what I can expect from Twyford which brand should I be getting to avoid this kind of BS in the future?

thanks,
Simon.

 

[rpm]

At some point in time the cistern flush / dump valve will require cleaning or replacement so allow access for this.

 

[Chalked]

If your tiling the cistern in you need one with full access. This is made through the flush plate. A
sp quality cisterns like geberit, Grohe and Viega have no joints on the flush pipe, only the short pipe to the pan. Most have a bracket to secure this too.
twyford is a budget cistern made predominatly for use in units where you can remove the panels for access.
Geberit UP320 | Concealed Dual Flush Cistern

 

[WHPES]

You need to cut as big a hole as possible behind the pan so you can get your hand in to replace any flush valve etc at a later date. Mark out where the pan will go and cut out about 4cm inside this profile.