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Pyro Probe Thread Size.. The other side

3K views 9 replies 3 participants last post by  Betaracer 
#1 ·
What size is the thread of the pyro probe that connects to the fitting? I have a bung welded in my dp and I relocated my probe to the manifold.. Finally

Anyways I want to put a cap on that bung. I know it's not 1/8" NPT.
 
#7 ·
I remembered I had an Autometer EGT probe in my box of left over/damaged/replaced parts. The end in question measured to 11M (.4300") x 1.25 (I don't have a TPI gauge at home), but that's not to say there isn't a common Imperial thread that converts. The nut holding the probe in requires a 5/8" wrench, and none of my metric wrenches fit properly. I will need to look at a 1/4" compression nut to see if it is the same.
 
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