First, using a magnet won't answer the question because if they are steel it would be stainless steel and most SS are not magnetic. My PP guru also says to use teflon tape, but he also said he's never seen aluminum stems on an RV al wheel. Al stems are used mostly on cars.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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