Tapered thread plug. No shoulder for a crush ring on them.
I have read here that some people use a small amount of Teflon tape on the last bit of thread on the plug (not the leading threads going in) plus a bit of anti seize.
I just used some aluminum anti seize and had no drips.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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