Fuel injejctor cleaning conventer TPU

I printed tpu and it worked. It is tight enough both end so spray wont come out when you clean injectors. 

My fuel injejctors are from 2nd gen prius. The diameter of big side hole is 9.5 - 10 mm. 

The small side hole is also tight for spray tube. 

If your dimentions are different, better you play with sizes if you know how modelling. Its very simple to model also.

I did not try PLA. You can try if it holds tight.