Hi Stephen,
The tank end of the tap is 1/8 BSP (pipe thread 28tpi). The other end is not important if you are buying a new tap as they usually come with a spigot, but I think it will be 7/16″.
I have not got them listed online yet but I’ve got 4 different styles of 1/8″ taps plus the fuel line, washers etc to suit. Give me a call if you want, phone number on my website (link below). I can email photos etc.
Best regards,
Richard
