POTTER VSR-4eBayProduct Overview The Potter VSR 4 is a vane type waterflow switch designed for wet sprinkler systems, providing reliable detection of water movement for fire alarm signaling. UL Listed, FM Approved, and compliant with NFPA standards, the VSR 4 is suitable for steel pipe schedules 1040, ranging from 2" to 8" (50200 mm). The device is equipped with two SPDT snap action switches and an adjustable pneumatic retard, which activates when flow reaches 10
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