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Just for my own education what effect is there on flow in PEX tubing wigh some of the fitings in use? I'm installing a small radiant ceiling using 1/2" PEX-AL. The compression fittings have an internal opening of 5/16". In this case there are only two fittings one on each end of about 150' of tubing. Also I see on manifolds most of the compression fittings have smaller internal openings. Is this restriction just more of a function of adding an equivelent length of tubing? Obviously these systems work, I'm just trying to educate myself. My background is more with open drainage systems, ditches, pipe flow and flood control pumping systems not closed systems. We use some of the same factors but in a different way, length of pipe, roughness, slope, velocity, and head pressure due to gravity. Thanks Mike