... resistant 2.Submersible motor 3.Mechanical seal 4.MOQ=1 4 inch submersible water pump New products,4,5,6 inch cast iron sumersible ... , pump unit should be less than 70m below the static water level.4. The distance from the motor bottom to well bottom ... and removal, small area. 4. Simple using and maintenance. 5. Safe and reliable operation, no pollution to water, etc. 4 inch submersible water pump