You'll want to:
-Use 15mm CPAP hose.
-The CPAP hose is modeled in Fusion 360 as a CCW Coil with 6mm Pitch, 17.1mm Diameter, and a 2.5mm section size. This lets you screw the hose into the fitting and replace it if needed.
The author marked this model as their own original creation. Imported from Thingiverse.