[Tigers] hose fittings and adaptors

[Owain Lloyd]

can anyone identify if this fitting is AN or NPT or tell me how to
check?  and if so is it 3/8 NPT, 6AN, or some other size?

http://owainlloyd.no-ip.com:8080/photos/Tiger/Carb/slides/CIMG3055.JPG

i need to buy some fittings to install a pressure gauge and regulator
which are NPT.   any recommendations on places to buy them from would
also be appreciated.

many thanks.