Carb Heat Ducting

[Gambit]

Hi All

I live about an hours drive from where I hangar my J3 Cub. Whilst I was working on my Cub earlier today, I noticed that one of the red ducting tubes that runs to the carb heat intake box was slightly perished.

I forgot to measure the diameter of the tube before I left the hangar.

Does anyone know off hand what the diameter of these tubes are?

Cheers
Ivan

 

[bob turner]

 

[cubdriver2]