Remixed Dragon Hotend 40mm Fanduct by eponra to fit the Rigid mounting adapter for Trianglelabs Dragon hotend
The ring should go on the mount and the eyelet on the bottom aligns with the tightening screw of the fan duct.
You will need to replace the screw with a longer one (12mm should work).
//Update: I was a bit concerned at first the proximity to the heatblock might deform and melt the PETG. I've since printed for about 20 hours (unenclosed) in total with a 5-6 hour print being the longest and can't say I see any deformation.