Review on ZDK-C8 10PCS High Pressure TR600HP 🔧 Tire Air Valve Stems with Caps for Tires by Doug Ellingson

for trailer steel wheels. They fit pretty loose and I was afraid they would leak. I bought a few at the auto parts store (72 cents each) and they are firmer and the rubber is much softer and more pliable. That's when I realized they had harder rubber, which further exacerbated the leakage problems. The difference in diameter between the two is only 1-2 mils, but that and the softer rubber make the product much, much better at the auto parts store. Unfortunately I cannot recommend them at all. Go to an auto parts store.