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antique autocall sprinkler flow switch | eBay
Flow-Switch Tester eliminates need to discharge water.
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1144406 Potter VSR-6 Sprinkler Saddle Type Flow Switch 6in DN150mm 5.563in 168.3mm
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1960's antique ADT sprinkler flow switch | eBay
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EN 12259-5 Fire Sprinkler Flow Switch from SIKA
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