I measured the thread on my fitting that is sticking up from the mani...best I can see it is .670....which would be 3/8 NPT.
I have a 1/2 plug and a 1/4 plug...1/2 too large and 1/4 too small.
Funny....i don't have any 3/8NPT plugs:huh:
My bet is 3/8.
And :1st: prize and a case of :mobeer: goes to Paul for the process of elimination. Went to Ace Hardware and they had 3 size plugs. 1/2 inch...I know that's too big. 1/4 inch, that was definitely too small, and 3/8 inch, which looked right and was the correct size. Now I need to buy some
Permatex blue threadlocker to make sure when I install it it is sealed and doesn't corrode in place. Although brass normally doesn't do that.