Originally Posted by
Possum1
Could this be because they are using tubes for a boat trailer tyre rather than an aircraft tyre?
Or it could be the typically skint aircraft owner having a forage in the area of the servo where he last pumped up the tyres of his car for tyre valve caps lost by previous motorists and using them on his aircraft.
Meh, so what? For the record, all my valve stems have the yellow painted metal caps which came with the tubes, but can you explain how safety would be compromised if one went missing and I replaced it with a plastic cap from an automobile tire?