I have been using one for many years, think of this if the hose is connected it still has to make a 90, or a bend, which will restrict the flow as well, an elbow hos less of a restriction and assures adequate flow. 90 degree sweeps are common, actually standard, on fire apparatus because they reduce the friction loss..vs hose crimping.
The elbow also prevents wear on the hose.
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Bill M
2012 Georgetown XL 360
2011 Chevy Equinox - 2006 Chevy Avalanche
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