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Water Tank Shut off Valve

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8 minutes ago, DavidPeckham said:

Cheers all, that'll be why I can't find any 7/8 ones then!

BSP thread sizes have little relationship to the measured size, as you've found out. The 1/2" in 1/2"BSP was originally the inside diameter of the pipe on which the outside of the thread was to go. Not applicable to anything much these days, but BSP has become a near world wide standard for plumbing fittings, so the confusion remains. A chart of nominal BSP size, major diameter across the outside of the threads and the number of thread turns per inch is useful to bookmark. More details here. Everyone loves standards. That's why there are so many of them.



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