Backpressure (Back•pres•sure)

1. A reverse pressure greater than that in the intended normal direction and/or pressure of flow or thrust

2. An escape of liquid by virtue of the physics of a simple siphon.

3. Pressure in plumbing pipes that is less than atmospheric pressure.

4. The flowing back of used, contaminated or polluted water from a plumbing fixture or vessel or other source into a negative pressure in such a pipe.

5. A pressure in the supplied system which, for some cause, becomes greater than the supply pressure (pressure above atmospheric.)

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