Quote Originally Posted by roadster32 View Post
Dave i've worked with C4's all my life but never seen one with 1/8" NPT threads.
Oh well - no big deal. If the OP can use a 1/4" NPT to chase the threads, then the 1/8"NPT will just rattle in the hole or the 1/4" wont fit if it's the other way

And as far as C4's yep, had a few apart myself