3D resin printed replica of the Cessna 172 Air vent silencer control knob (S1390N5), air vent cap (0713250) and trim ring.  They mount in the cabin on the fresh air silencer box.  (0710013-4, 0710013-5)

I have test fit these parts on a 172 air silencer and they fit very well.  I paint all parts to closely match the original Cessna interior color. If you have an owner maintenance certified aircraft these pieces will fit in just like the original.

Product includes:
1 x control knob
1 x air vent cap
1 x trim ring
1 x spring