It's a tiny sucker literally right beside the engine coolant temp sensor. Kinda has a little copper nipple head like a valve. Manual shows it in illustrations over and over again near ECTS but doesn't refer to it? Is it removable. A part number if removable would be awesome....

Thanks AGAIN guys.

 

If I understand your question, this post should help...
https://landroverforums.com/forum/di...77/#post419823


and here is a source for the part....
http://www.roversnorth.com/ProductDe...=PLC036&type=0


P.S. - put specific year/model of your truck in your signature. It will be much easier for folks to help. Put you location in your profile and you may find local resources.