14 Keeping the air in
Those shiny new Toyos your fourbie is wearing are nothing without having decent valve caps especially with the approach of winter. Losing a plastic cap is a good thing, when replaced by shiny silver one, for you’ll have a cap that continues to thread on and off and not cross, and keep the mud and slush out of the valve core. Plenty of winter run flats have occurred when an uncapped valve has been filled with crud and starts to leak, the driver oblivious until too late. It’ll probably be the cheapest accessory you’ll buy for your 4WD.