Anyway, I was reading your article about Motorcycle Tire Metal Valve Caps. The writer mentions that the supplier doesn’t carry these caps anymore. But Aerostich carries these NoLoss Valve Caps (#4602.

Diagnose and fix a leaky valve stem You topped off the air in your tires, but a few days later, you notice that one of them is low again. It could be a hole, but before you go through the hassle ...