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Gems^® 70821 flow switch is part of the FS-927 series family.  Featuring a compact size, the FS-927 switches measure only 1″ x 2¾” and are ideal for use where space is at a premium.  With those specifications, the FS-927 series switches are appropriate for high volume OEM applications and well suited for use with water and oil. They can also be used for coolant or lubricant flow monitoring in portable equipment and many other applications with space constraints.