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Continue to ChatASCO 61000314 - 2/2, External Frequency Input NPN, Double Loop Cascade Control, G3/4, Series 610 ASCO Motorised Control Valve https://www.valves-direct.com/product/asco-61000314-2-2-external-frequency-input-npn-double-loop-cascade-control-g3-4-series-610-asco-motorised-control-valve/