The Schneider Electric (Square D) 9038CG36 Float Switch Pressure is a durable and precise liquid level control device used in HVAC, pump, and hydronic systems. It operates by detecting fluid levels and activating or deactivating pumps or valves to maintain proper pressure and prevent overflow or dry-run conditions. https://www.partshnc.com/9038cg36-schneider-electric-square-d-float-switch