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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
Pressure differences in a down pipe can be reduced by implementing joint-free zones, appropriate types of joints for connectors and the proper sizing of the down pipe. Underpressure arises in a down pipe as a result of a connector draining. waste water into the down pipe.