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A strainer (popularly known as floor drain cover or floor grating/grate) should always be used all the time to protect the floor drain.
Essentially a floor drain is really a plumbing fixture installed in the floor with the objective of removing water area it. A floor drain usually is http://www.jonite.us in various shapes for example round, square or rectangular. Starting from 2 inches to 12 inches, most floor drains are 4 inches in diameter. Usually produced from material such as metal or plastic, the gradient of the floor near a floor drain is usually sloped to let gravity do its job of