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Originally Posted by greenman100
internals of a T do cause turbulence
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I wonder no one's mentioned "Y"s then. "Y"s branch cleaner and merge cleaner, and require not much more effort to set in. They're typically shaped like "K"s without the front leg; branch is 45 degrees. Very common fitting. Then use an equally common 45 degree bend to get 90 or parallel.
Good plumbers consistently use "Y"s over "T"s except where flow will be greatly restricted anyway (by a waterblock or vanity sink) further down
both lines. Ahem.
Turbulence shouldn't be an issue in a big passive pipe rad. There I think the priority should be getting the largest surface area for the time and money invested, and if the rad's sprawled across a wall it ought to please the eye too.