"This flux is head and shoulders above any other on the market. I find that I have a near 100% success rate with all kinds of fittings - end feed and solder ring. I have done some 28mm work recently, with an underpowered blowlamp and it still never let me down. It just works."
"Very apprehensive as my 1st go at plumbing, so checked out the videos on youtube & bought de burr tool, pre soldered fittings, flux & mat. it was so easy to do & no leaks, saved a fortune on a plumber"