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Continue to ChatASCO - HB21A218S - 1/8"NPT External Process Connection, Watertight Enclosure, Series H Suffix S - Tri-Point Miniature Pressure Switches https://www.valves-direct.com/product/asco-hb21a218s-1-8npt-external-process-connection-watertight-enclosure-series-h-suffix-s-tri-point-miniature-pressure-switches/