Do I have tubes in my tires?

/ Do I have tubes in my tires? #11  
This is the 16.9x28 - RimGuard filled - rear tire on my Kubota M6040. It's tubeless. I will get better pictures when the sun comes up and the temps get somewhere above 15F. This shows the metal stem and metal securing nut.

View attachment 630797

I am surprised that Kubota put rims on your tractor that do not have valve stem guards.
 

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