Discuss Tap make for Traditional bath mixer tap with a non standard Fitting in the USA area at PlumbersForums.net
My plumber told me it was 1inch1. What makes you think they are 1"?
2. 3/4" BSP threads (the norm for bath taps) are 1.04 inches across the outside diameter.
3. One inch BSP threads are 1.3" across the outside diameter.
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