A vehicle cabin is a small, enclosed space. Run an ozone generator inside it and you lose control of concentration fast. You also have nowhere good to set the unit. The Single Auto Kit solves both.
A flange mounts to the vehicle exterior. A 5-ft hose connects from your Rainbowair Activator. Ozone feeds directly into the cabin from the outside. The generator stays on the ground or a cart next to the car, you control the output level, set the timer, and walk away. Ozone works through the entire cabin, reaching the headliner, carpet backing, door panels, and every surface the odor has soaked into.
This is exactly how we treated a couple of old Hondas that came in with mildew worked deep into the plastics from years of sitting in unconditioned storage. Treating from the outside gave us a controlled process without the risk of over-ozonating a tight space. The foam blocks seal around the hose connection so ozone goes into the cabin instead of escaping out.