
They are in Brass and come with a thread ( I had to contact "AEROMATE" for the size of the thread) so after removing the ABS Blanks you can tap in a thread and screw them in place,
I use one of mine as the access to the"TARR" Smoker refill pipe.

I knew you wanted extra work which is why I offer this to your plan,

Seriously your attention to detail is an absolute knockout.
Shaun.