15mm pipe 1/2" BSP tap conector won't fit Grohe tap
Quick google suggests you need a 12mm connector, not 1/2". Quick search of the Grohe site suggests there should be a flexi tail with the tap.
I've bought 1/2" BSP tap flexis and they fit, so I think I can be confident about the thread size.
Pity there's no ready solution to getting rigid tap connectors to fit the taps.
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