In message . com,
Bookworm writes
Nigel Molesworth wrote:

PTFE tape is not for compression joints. Use Boss White.

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Nigel M

Wrong. Been using PTFE tape on Compression Joints (where needed) for 30
years. Boss White is not suitable for potable water. Must conform to BS
6920, it doesnt. see www.tool-up.co.uk/shop/diy/MISBW.html

True, but Boss Green is/does.
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Chris French