UberBlue I am not ignoring this thread or you but have been pretty busy with some other products. You can find k coefficients for some common fittings used in wcing in this article:
http://www.procooling.com/articles/h...s_with_h2o.php
I am more than willing to generate more numbers such as the curve for quick disconnects Bill just posted. I am still fiddling with my digital pressure gauge though so it may take a bit.