It was a long time ago when I did mine, but from memory it's all 1/4 BSP. Gas or Pipe threads are confusing because as already stated, the size ie 1/4" refers to the size of the pipe. The actual outside diameter of the 1/4 BSP thread is 1/2".
I had SS braided fuel hoses made up with male ends and 1/4 M&F fittings in the change over valve. Search through the Green Spark plug site for ideas. Ron
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