Just trying to find the names of some companies that manufacture aircraft tube-type and tubeless tire valves. I've been searching for about a week now and no luck on specific companies that do this. Thanks.
Goodyear's website has lots of info, but I didn't come across anything specifically about the stems. You should just phone them and talk to an engineer.
Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout