I agree with you Kev plumb, never heard of if it before, but as i understand it, this is, a forum to help ppl, and help plumbers alike and not an ego boosting, site to get your rocks off, personnaly a masage parlour does it for me.!!, just kidding wife walked into room. None of us know it all, and i believe some time spent with ppl whom, are not offray with plumbing isnt a bad thing at all. P.s. what do you know about neurology ??. No offense, intended, Laboured on a spark today and felt totally thick. Only good at your own game, and i learnt that today !!