Originally Posted by
1QwkSport2.5r
The discharge nozzle is pressed into the barrel. The threaded portion the needle valve screws into is machined into the outer needle valve housing. See my pictures. It appears Cougars carburetor was possibly crashed (and thus broke the threaded part off) and the previous owner drilled and tapped the outer housing to plug it to use a RNV. Here's my .330" EZ carb's needle valve housing and related parts:
In that case, any RNV will work. No need to get a specific Fox model, although they are nice.