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[1 2 INCH SIZE] HFS 15 paddle water switch features a 1 2 inch interface that suits matching pipe connections in water treatment HVAC cooling and fire protection systems for dependable installation. [ADJUSTABLE TARGET] Includes 3 paddles with adjustable blade number and length to suit different pipe diameters and conditions helping the switch respond when exceeds the set value. [SPDT 220VAC 15A] Built with a single pole double throw micro switch rated 220VAC 15A and contact life up to 100000 times enabling stable interlock disconnection and system protection control. [WATER AND GLYCOL USE] Designed to detect of water ethylene glycol and other non corrosive liquids with liquid temperature range from minus 10 degrees C to 100 degrees C under non icing conditions. [DURABLE INDUSTRIAL BUILD] Brass joint iron plated shell and plastic outer casing support use in central air conditioning water cooling units and industrial pump equipment.