A manual valve directs the flow of oil through either of the elements. When duplex strainers are used, one element can be bypassed, and the element can be removed and cleaned without disturbing the flow of oil through the other element to the engine. The valve must be sufficiently large to bypass all of the oil around a clogged strainer to maintain an uninterrupted flow of oil to the engine. Metal-edge strainers consist of a strainer element surrounded by a case that serves as a sump to collect foreign material and water. Most strainers have devices for manually rotating the strainer element against metallic scrapers, which remove the material caught by the element.
Strainers usually have vents for releasing air from the system.
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