WERTO 3.5SD Stainless Steel Submersible Deep Well Pump Motor https://www.wertome.com/product/3-5sd-submersible-deep-well-pump/werto-3-5sd-stainless-steel-submersible-deep-well-pump-motor.html Motors are designed with quality material and unique features to assure years of dependable operation. Oil-illedmotor keeps windings cool, permanently lubricated bearings to provide reliable pump service. Waterling double-insulatedcable entry system prevents capillary action and protects against moisture. Arubber diaphragm is provided to guardagainst pressure and volume variations due to thermal expansion of oil inside the motor.