This is just my observation on the newer units (built with convenience center) with seemingly lesser shower, sink, lavoratory output than older models. With the addition of the convenience center came a bunch of extra valves and fittings for our added pleasure. Although right handy, it came at a price ... lesser flow than older models minus the center. Reason ... all the extra valves and some fittings have a much smaller hole than the 1/2" water line. Smaller hole = less flow at a given pressure. To support my reasoning, take a line off any one of the valves behind the center and look at the port diameter inside that valve.
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