Join Date: Jun 2002
Location: USA & Singapore
Ferrari Life Posts: 5,509
No, the cap doesn't hold the air in, it just prevents dirt from getting into the valve core.
I agree with Peter, I wouldn't mind having them, but they are awefully easy for some punk to twist off and stick in his pocket.
'79 308 GTS, '82 Jeep CJ7 Jamboree
"Time is what prevents everything from happening all at once."