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Title: Not the best design
Review: I tried these on two different cars and several tires leaked down over a couple of weeks. My first suspicion was these valve caps which turned out to be correct after I sprayed a mixture of soap and water on the caps. There was a very slow leak around the cap seals.Sorry, but this product is a terrible idea because it permanently opens your valves. That's just asking for a leak to occur due to leaking seals, sun-cracked valve housing, etc.The in-tire pressure system may be expensive but at least it doesn't cause a leak in your tires.
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