It is 1/4 in pipe thread.
JW is right about poking a wire or long screw driver in the hole. If its just a little scum on the surface it will drain right out. It could be a whole lot of crude. It so it will need to be flushed out.

George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum