Hardly any time seems to go by between seeing people search for adaptors to fit one size of extraction port to another.
I've a simple method using scraps of pipe that people might already have or can scrounge on freecycle etc
I've picked near random requirement to adapt from 22mm to 57mm just for the sake of an example.
Pick a solvent weld UPVC pipe size somewhere in the range but ideally near the upper size.
Cut a number of pieces say about 30mm long. split one lengthwise.
I apologise for the grotty state of the pipe - its been lying in the garden for some years. you can use any colour you like not just green
Make a second cut to nibble out a small piece.
Fit the piece into the end of a piece of the same pipe.
Repeat the process cutting a bit more out this time
And again
Get the idea? one more time
Now offer it up to the 22mm pipe
All those little bits you cut out can also come in useful if you want to increase the diameter
Split another piece
Fit it over the pipe this time and you will be left with a gap.
Sort through the offcuts and pick/trim a piece to fit in
the end view looks like this
Final outside diameter
Obviously you can repeat the process to increase the OD if needed.
Take all the parts out placing them in order. put a smear of solvent weld cement on the inside of the pipe and insert the first piece and repeat to fully assemble the adaptor make sure none of the cuts line up. Add the outer layers in the same way. clamp with tape or a jubilee clip and allow to dry.
Hope this helps
Bob