Teflon tape on pipe threading

Telfon (PTFE tape) is the most critical of plumbing substances. It forms a seal on the olive or joint and won't bind/stick to the surfaces under pressure as it's inert. It's as cheap as chips too - around 3 EUR for a roll.

Have a look at the application methods on YouTube as there is a right and a wrong way.

Hi, in fairness it might need 5 or 6 wraps of PTFE, and we didn't tell you that.

Question... is it leaking at the water feed adapter part where it fits onto the existing piping?

If that's where then you might be hitting an issue with UK plumbing being a wider diameter that Irish plumbing. Sometimes that can be resolved with an Irish spec adapter, but other times it just needs to tightened up with yet more wraps of PTFE.

More info here...

https://www.thetapshop.ie/irish-copper-pipe-vs-metric-copper-pipe/

More PTFE it is then! As it's the incoming mains, it's under a lot of pressure. You need to get it sealed so that it's not weeping and a concern in the future. 👍️

Not much tape on the first threads there, use more tape! No need to tape the nut at the end just the threads. Wrap it tightly as well not loosely.

No, tape all the way but not over the edge, well that's how I do it but others might say otherwise.

Remove this tape as it's not doing anything

I sometimes twist the PTFE tape to make it into string and use that the fill the threads before using the PTFE tape flat to cover the threads at least 5 times.

Another old trick that some plumbers still like is to rough up the threads with a file so they grip the tape better but thats really a throw back to the old hemp and jointing compound days.