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  2. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

  3. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Backflow means the undesirable reversal of flow of a liquid, gas, or suspended solid into the potable water supply; a backflow preventer is designed to keep this from happening. Points at which a potable water system connects with a non-potable water system are called cross connections.

  4. Waterline - Wikipedia

    en.wikipedia.org/wiki/Waterline

    A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position. Hence, waterlines are a class of "ships lines" used to denote the shape of a hull in naval architecture lines plans.

  5. Hydrostatic test - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_test

    A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks. The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection, and pressurization of the vessel to the specified test ...

  6. How to write a check: A step-by-step guide - AOL

    www.aol.com/finance/write-check-step-step-guide...

    6. Sign the check. Sign your name on the line at the check’s bottom right-hand corner. Sign legibly, and make sure to use the same signature on file at your bank. A signature confirms to the ...

  7. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical ( plumb ). Two basic designs exist: tubular (or linear) and bull's eye (or circular ). Different types of spirit levels may be used by carpenters, stonemasons, bricklayers, other building trades workers ...

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