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Flow Switch Flow Switch, Harwil, 3/4" MPT, 3 SM, NO, NT, 6FT, 1/2 Amp, 50 Watts Not For Spa, 1-1/2" paddle Lenght by Harwil | Spa Parts + by Allied
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iSpring 1-GPM 11-Watts 110-Volt Transformer Ballast with Smart Flow Sensor Switch for 11w UV Disinfection Sterilizer System : Amazon.ca: Tools & Home Improvement
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