In an earlier contribution to this discussion,
The Medway Handyman wrote:

What is it with plumbers & fibre washers in tap connectors?

Its actually rare to find one. Usual practice seems to be to wrap
loads of PTFE tape around the bottom of the connector & hope for the
best.
Helping my daughters bloke remove entire bathroom today prior to
refurb, not one single tap connector had a washer, all bodged with
PTFE.
Bearing in mind a bag of 100 is only £3 why don't people use them?


I've had quite a few that have gone soggy and/or crumbled over a period of
time - and then they leak!
--
Cheers,
Roger
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