Hi guys bit of an update. So I've redone the whole section. New copper pipe, new pressure fittings, removed all the PTFE tape from the pressure fittings. The pressure fittings and everythere is leak free except 1 spot. Between the the White dielectric and 1/2 to 15mm fitting. What I did to install was wrap 15 wraps of PTFE tape around thread, I put a smear of the jointing compound around it, screwed it all up, left it over night as per the instructions in the manual that suggestd 2-12hours so it had plenty of time. But still, sadly, a small leak from it. I'm starting to think the dielectric junction itself is just faulty...or something. Is there something I can replace that with ?