Review on Milton S 441 Brass Valve Extension by Joshua Garris

I hand tightened them properly and put the original plastic valve caps on them. In two days, two tires lost most if not all of their air pressure. What might have happened is that the cap pushes against the piston in the extension when you put it on and the depressed tire valve stem then seeps into the ring between the extension and the valve and flows out through the metal threads between them. I also suspect that the silicone sealing washer is defective. Bottom line: complete nonsense. Avoid.