Just wanted to give a try of the thingiverse customizer, which may help people looking for some specific adapters :)
FYI: all values are specified in millimeters in the customizer!
This is a derivative of my own thing & webservice http://www.thingiverse.com/thing:26096
This is a parametric hose coupler through a webservice. It can create STL files directly for adpators (adapters?) that couple two hoses or pipes. Hey, you can even make funnels with it!
Just provide your own dimensions and get the file!
The customizer lacks a few control on the values imho (eg. how to force a variable to be positive?). Now, it is probably a work in progress that will get better with time, and it is nonetheless extremely useful.