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Continue to ChatASCO - HC21A218 - 1/8"NPT External Process Connection, Watertight Enclosure, Series H - Tri-Point Miniature Pressure Switches https://www.valves-direct.com/product/asco-hc21a218-1-8npt-external-process-connection-watertight-enclosure-series-h-tri-point-miniature-pressure-switches/