Plumber say he can't fit our modern toilet cos the building's soil pipe is narrower than the toilet's-This true? He says that here is a high risk of the toilet blocking....

He says that here is a high risk of the toilet blocking. If this is true (probably is) can we do anything to mitigate the problem?
Your plumber is talking rubbish, within the UK there is a device call a "Multi Quick" which reduces the size of your toilet outlet into the soil pipe.


If I'm not mistaken, there are adapters such as a 4 inch to a 3 inch....etc....
The foremost problem is that you'll be initially able to flush a undisputed amount of "stuff" but once it gets to the smaller portion of the pipe, it creates a bottle d¨Ścolletage so everything will slow down or even come back up.....
Cant he find a toilet to adopt the existing size of the pipe?
Answers:    I'm a GC, not a plumber surrounded by the strict sense; but I am confused a bit. I want desperately to assume this "PLUMBER" assumes other issues, beyond fitting reducer/enlarger/transitional fittings?

Certainly without knowing at adjectives the situation; the new toilet; the size of the existing misuse plumbing; or the need to replace the toilet; supposition might be adjectives you get here?

Did the blockage problem exist near the old fixture? What ID does the throw away plumbing have currently? What's the GPM flow rate of the different fixture? Etc. Etc. Etc.

Steven Wolf