I need to drain down a hot water system soon to fit a new sink (no stop
cocks at all on the hot water side).
To save time, would buying one of the £9ish pipe freezing sprays work
for the 5 - 10 minutes that the 15mm pipe is likely to be open while an
isolator is fitted?
If so, then it could save me a hour waiting for the drain down.
Thanks
Alan.

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