The Schneider Electric (Square D) 9037HG32Z20 2.5" Float Switch with Viton is a durable liquid level control device designed for use in HVAC, pump, and hydronic systems. It operates by detecting fluid levels and automatically opening or closing electrical circuits to regulate pump or valve operation. https://www.partshnc.com/9037hg32z20-schneider-electric-square-d-25-flt-swt-wviton