Fire hose adapter/connector

This adapter connects a 3" fire hose to a G 1-1/2" outer thread on a pump.

The model was printed in blue TPU and in a first test water pumping test it worked flawlessly.

This pump with the fire hose is put into a plastic box with a lot of slits in it and serves as an emergency setup in case the basement (or something else) will be flooded again. 

@note: I had to render the outer and inner form in two seperate runs and substract the inner form from the outer form in a second part (cobine.scad) because openscad could not handle to render so many entities in one run (especially the threads).