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The VSR-C is UL Listed for use with Type K , L , and M copper pipe in sizes 2" to 4" (50mm to 100mm). It is an ideal choice for fire sprinkler systems requiring a copper pipe waterflow switch that meets high-performance standards. The device can also be used as a sectional waterflow detector in large systems to provide efficient monitoring across various sections of the sprinkler system. Equipped with two single-pole, double-throw snap-action switches and an adjustable pneumatic retard , the VSR-C ensures accurate activation only when the flow condition meets the selected retard time, minimizi