Which characteristic is not typical of a "submersible" pump?

A submersible pump is designed to operate underwater and is completely submerged in the fluid it is pumping. One characteristic that is not typical of these pumps is the requirement for water lubrication. Submersible pumps are engineered with sealed components that prevent water from entering the motor and electrical sections, allowing them to operate efficiently without the need for water as a lubricant. Instead, these pumps often utilize other types of lubrication suited for their design, such as oil or grease.

The other characteristics highlight advantages of submersible pumps. They can be installed vertically, often in uneven or crooked holes, which is a practical feature for installation in varied environments. Submersible pumps are also less prone to vandalism, as they are submerged and not easily accessible. Additionally, these pumps typically operate more quietly compared to surface pumps because the fluid in which they are submerged helps dampen the sound of their operation.