The clip to connect the brush to the hose was broken.
I created an adapter plate.
update 9/3/17:
new file with reduced clip size for easier mount / unmount.
Printer: Geeetech G2S pro
Rafts: No
Supports: Yes
Resolution: 0.3
Infill: 100
The author marked this model as their own original creation. Imported from Thingiverse.