Unnati UW3 series submersible motors are perfect for water-wells of 3-inches or larger diameter as it maintains uniform clearance for improved efficiency and longevity. The pre-filled motor comes with a mixture of clean water and anti-corrosion fluid. Fitted with polypropylene copper or winding and shaft seals, âOâ rings and sand guards these prevent lubricant leakage or ingress of well-water and pollutants. Additionally, the pump is fitted with radial and thrust bearings (water-lubricated) that resists the elevated axial thrust loads. The pressure-equalizing rubber diaagms protect against the varying volumes and pressure and hence useful for residential use, fountains, gardening/horticulture, and pressure-boosting units.