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I think you could force water into places you don’t want it, like the engine. Or, if a blockage occurs while introducing higher pressure, you are gambling that the blockage is weaker that the hose connections(or paths to the engine) and that the blockage will blow through before enough pressure is introduced to dislodge hose connections. So 55 is likely the amount that won’t cause harm in case of a blockage, but is enough to achieve the drainage objective.
 
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