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I had a small fire on my car a few weeks back. The valve core was leaking. So I did the tire valve core thing to get by. I did a ton of reaserch and found the OEM replacements for the fuel rail. So when I got the new one I pulled the Tire core out and the thing had swelled up and was coming apart after only a week or so. When the valve core was new you could not see any red on the cup end of the valve. Now you can..
Let me know if you are in need of some valve core's. I had to buy in bulk to get them. I have an add in the for sale section.