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Gems® 170235 low cost flow switch is part of the FS-500 series family. Made for threaded plastic piping, these switches offer low cost flow monitoring with a variety of switch actuation points and low pressure drop. All wetted parts for the FS-500 series are polypropylene or stainless steel, making this switch ideal for a wide range of chemical and temperature requirements. The materials are also NSF or FDA approved for potable water treatment applications including chlorinators, purifiers, and heaters. The FS-500 is ideal for equipment cooling including welders, lasers, etc.