What are you connecting to? If you have a standard 1/4” quick disconnect, you just need the silver plug. What you need to connect depends on how you intend to connect the foam cannon to your pressure washer.
Nice Volks!! I would go with a lighter color as well so that you can actually see the wheel pattern. If I was to go with a dark color rims, I would want a polished lip.
If you are driving once in awhile during the winter just to warm it up, I wouldn't bother. Don't drive it during the winter months. Better for the car.
Re: NEX FLEX Cordless Polishers!
The lithium ion battery that I use on my Ryobi power tools is significantly weaker towards the end compared to a fully charged battery. Just like the Flex battery, my Ryobi battery has a charge indicator.
Sounds like you have the foam gun which is supposed to be used with a regular hose, not a pressure washer. Foam cannon is specifically made for a pressure washer. You can't use a foam gun with a pressure washer.