This Square D 9038DR8 float-operated mechanical alternator for use with water, hydraulic oils, and corrosive fluids switches between duplex condensate pumps within one closed tank. NEMA 7/9 enclosure protection for use with water, hydraulic oils, and corrosive fluids This mechanical alternator has a 2-5/8" maximum water level change post. 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 its products continue to earn customer trust today.