Yes I think Rik is correct. I missed the adaptors on your taps. From memory the adaptors are 3/8" BSP which are tapped to take 1/8" BSP petcocks. It all gets confusing as they've often been altered/modified over the years. An M20 would have had two standard taps without any reserve lever. Again as Rik observed, you would use one tap left or right as your main tap and the other tap would be your reserve. Ron
A lot of the modern repro ENOTS taps are made from die cast zinc, which are quite interesting when you descale your tank with acetic acid... Not a lot left!
