Is this B&Q how to video wrong? PTFE tape on rad thread

[kingandy2nd]

I was looking to see if I needed to put PTFE tape where the olive for the part that goes into the rad meets with the trv.

B&Q how to video shows the PTFE tape on the thread of the trv rather than inside (behind the nut).

Is what is show correct? Feels to me like there could still be a leak from the olive doing it this way, or does the olive not need PTFE on this joint?

thanks
Andy

screenshot

video

 

[terryplumb]

Entirely unnecessary to apply PTFE tape to a compression fitting thread.

 

[kingandy2nd]

Entirely unnecessary to apply PTFE tape to a compression fitting thread.

Thanks, I thought that’s normally where they are used…especially for non pros that might over tighten joints

 

[terryplumb]

The olive makes the seal when it is compressed against the fitting and the pipe. DIY'ers commonly overtighten the nut ,and deform the olive ,or pipe ,and it leaks.

 

[ianmcd]

If breaking and re-making a compression joint, no harm in using a few wraps of PTFE on the olive, absolutely no point whatsoever putting PTFE on the thread

 

[Harry Bloomfield]

Wrong to use tape on those threads, the seal is not made there, it is made at the olive. I might wrap a bit of tape around the olive, or perhaps some Plumbers Mait.