> Actually, Huw, in this context, I believe this is 1.8 bar *absolute*, > not gauge. 0.8 bar over atmospheric comes out to approx. 12 psi, well > under the 20psi gauge that Ned mentions. Oh yes, my bad. dang measurement conventions! -- Huw Powell http://www.humanspeakers.com/audi/ http://www.humanthoughts.org/