This Square D 9038CG33Z20 float-operated mechanical alternator for use with water, hydraulic oils, and corrosive fluids switches between two pumps or motors within a duplex system in one closed tank. It has a NEMA 1 enclosure for protection, contacts that close on liquid rise, and Viton packing for media temperatures up to 250 degrees F. The float is positioned on the right. Square D switches are manufactured by Schneider Electric. Square D brand pressure, float, and limit switches have been synonymous with safety, quality, and reliable performance for over 100 years. First launched by Detroit Fuse and Manufacturing in 1902, the Square D brand and its products continue to earn customer trust today.