As I was finishing up the T-piece that came with the Vans Rivet based pitot kit, I basically twisted one of the ends off. This was quite disappointing, however, it enabled me to go and get a new T-piece being a model aircraft fuel T-piece. Workes brilliantly.
Only issue I had was that I needed to 'bend' the tube a little more than I would have liked and as a result needed to hold it down so that it do not rub on the top stringer.
I am going to review the panel clasps that I have installed as they don'rt seem to be holding as I would have liked. I may install with Tank sealant instead. That should do it.....