Grunta
Ptfe tape is about the best.
Ive never had anything remotely similar though so could he wrong 🤪
You need a medium weight tape.
Do not be tempted to over tighten the fitting.
If its tight and just past the 90 degree spot you need start again with more tape. Count how many wraps so you get it right the second time.
Will say this again as it is important. DO NOT be tempted to over tighten it or you will regret it!!
Simple fix. Big mistake if you get it wrong 😎😂




Will answer your next question tomorrow about how to remove it. Its easy btw . BUT Do NOT try to do anything with the back of the valve the pipe goes to .