Another hot topic for you Guys/Gals to share your knowledge.
My F1 and F2 air pumps have both sucked the kumura after 1 year, all be it after I upgraded my tyres to 33" thus exceeding the recommended air flow.
So ....
What to replace it with

Airconditioning compressor conversion not an option.
Require 12V options only at this stage.
Cheers Mike