Looks good and is well made, but my valve stems don't have enough strength to keep the caps moving for as long as they need to seal the root . Have to buy shorter caps.
Do not use aluminum valve covers. Aluminum will corrode the valve stem to the point of failure. Pressure sensing valves are $125 each. These caps are a safety issue.
This is a nightmare. They literally fused to the valve stems. It took a punch, spline pliers and a PB blaster to remove these caps! My valve stems are broken! Avoid it! Seriously, this is awful.