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Here is how I feed my fresh air helmet.
I used this adaptor I found on ebay Overstocked Sale 3 New Racing Helmet Hose Adapter 3
I had to trim the flange down some
With the back pannel removed from the truck I pulled the rear vent out.
The adaptor in the vent hole
Vent back reinstalled minus the louvers
Back in the truck
Can't wait to use it at the TRR
May I ask what brand and model helmet that is?
You know that the helmet isn't DOT approved correct?