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ELECTRIC CIRCUS BOARD W/TEMPATURE SENSOR CONTROL THE POWER OF HOT/COLD WATER CIRCULATING PUMP(4 X4 OR SMALLER), TEMPATURE SENSOR ONLY ALLOW POWER TO PUMP IN HOT MODE 90F-120F, COLD MODE 45F-60F, UL CERTIFICATION REQUIRED FOR US MARKET. water circulating pump, power control board w/tempature sensor electric water circulating pump,power control board w/temp sensors,