Customizable pipe coupler (for vacuum cleaner)

I have a cpap tube and I will to couple it with my vacuum cleaner, so I designed this one.

It was inspired in https://www.thingiverse.com/thing:300385/files from @ctheroux, but this is not actually a remix. I design it from scratch, thinking in give some tolerance to the possible errors measuring diameters and automatic created interface between both sides. Also with the possibility of no interface at all. All of this set up made from the data at the beginning.

This is my very first OpenScad design, constructive comments are welcome.