Flush pipes. Are there only two types/sizes?

[WaterTight]

The ones on cisterns like Grohe etc. Are they all 50mm - 40mm? And then the types you normally get with standard cisterns like Fluidmaster.

So if you see one of the larger type would this fit any of them (pan and cistern end):

Geberit Concealed Cistern 2" Flush Pipe & Rubber Cone 50mm x 44mm 119.705.93.1: Amazon.co.uk: DIY & Tools

And would this washer fit on any of the larger type pipes? (with or without the clip depending on which cistern/nut being used)

Geberit 50mm Flush Pipe Seal Washer & Clip For Concealed Cistern 240.139.00.1: Amazon.co.uk: DIY & Tools

Seeing more and more of them recently, want some spares that are "universal" on me.


Thanks.

 

[WaterTight]

Looks like despite there being loads of different flushpipes offered here, the euro ones appear to be all same o.d.


http://toiletspares.co.uk/page_58.html