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1831-1-RA-S | LOW DIFF PRESS SWITCH MR 2.5-9 | Dwyer Instruments Product Type_1/2-3/4HP Choose our HVAC supply store**Dwyer Instruments NCO 1831 1 RA S Low Differential Pressure Switch** The Dwyer Instruments NCO 1831 1 RA S is a reliable and accurate low differential pressure switch designed for precise pressure monitoring in industrial applications. **Features:** * Adjustable range: 2. 5 to 9 inches of water column * Compact and robust design for easy installation and durability * SPDT electrical switch provides versatile control options * Repeatability within 0.