3/8 BSP Racing Fuel
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Durite - Blow Torch Butane Cd1 - 0-450-99
Part no: 0-450-99Excl. Tax: $32.42 Incl. Tax: $38.92
The root diameter is 0.589" and there is 19 T.P.I.
The motoring industry use the outside diameter of the pipe for it's size and for 1/4" BSP you have the options of 3/8" OD pipe.
Abbreviations: O.D. Outside Diameter - I.D. Inside Diameter - T.P.I. Threads Per Inch