Thanks guys, just a general query for future reference, no particular application for now.
I used to know where to find various things,...(I know what some are thinkin' here.>!) but have forgotten through no need, and places of old have shut down or moved- had to do the Gas shop for copper bends last week, when replacing the coils on my Gutzzi- (don't ask, I'd have to tell 10 other stories to tell the story)