The potter vsr series is the industry standard for flow switches for fire sprinkler systems and is compatible with the widest range of pipe schedules 5 through 40 in the industry as well as all necessary listings and approvals for installation worldwide. The unit may also be used as a sectional waterflow detector on large systems. The model vsr st is a vane type waterflow switch for use on wet sprinkler systems that use 1 1 1 4 1 1 2 or 2 pipe sizes.
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