This was happened to Paul on Wheeler: a rock sheared the top of his valve stem off on one of his Jeeps rims, taking the top and valve with it. He posted this:
After running Wheeler, the Rubicon needs a lift and better skids, maybe 38's too. I have been thinking of some kind of valve stem protection too
So I thought I would see what was out there. Here are some links:
Valve Stem Protection
Gorilla Flush Mount Valve Stems:
Gorilla Automotive FLUSH-MOUNT VALVE STEM KITS - JCWhitney
Valve Stem Protectors:
valve stem protector, set of 5 Military Wheels Jeep Parts - The Long Olive Drab Line
SureValve:
http://www.hcwsinc.com/
Motorcycle valve stems, but why not?:
Bikemaster Valve Stems - 10mm | MotoSport
http://www.motorcycle-superstore.com/1/4/77/45855/ITEM/BikeMaster-Short-Aluminum-Valve-Stem.aspx?SiteID=Google_PLA077&WT.mc_ID=10012&esvt =0-GOUSC&esvadt=9-0-3886819-1&esvaid=30548&zmam=88421133&zmas=1&zmac=45&zmap=4 04458&kw={keyword}&gclid=CMDHs_6_0bACFSWFQAodLGbSX g
http://www.motorcycle-superstore.com...alve-Stem.aspx
Summit Racing Stubbys:
http://www.summitracing.com/parts/SUM-G1957/
Summit Racing Flush Mount:
http://www.summitracing.com/parts/SUM-G1958/
Mr Gasket Flush Mount:
http://www.summitracing.com/parts/MRG-5102/
Hope this helps!