Yeah. as I plumber myself, I wouldn't want to put my name to use of a self-cutting tap, but they do work. Some customers have needs that are about speed and lack of disturbance and would favour a quick job over doing it 'properly'. In fairness, self-cutting taps seem to work okay until they are disturbed, though I do wonder if they are certified to any standard that makes them 'suitable' for use with potable water.

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