12 Volt Water Pumps are used for boats, homes, and campers and are considered a Harbor Freight Tool. 12 volt water pumps pump up to 200 gph, and are not to be used with fuel or flammable liquids.

As the name suggests submersible pumps work underneath the surface of the earth. Unlike regular pumps they push water or other liquids to the surface instead of sucking it up from above the surface.

if your talking about the hydraulic suspension ( "switches" ) i use 40 weight motor oil and never have any problems

It is understood that the metering pump is a special volumetric pump that can meet various strict process requirements, and the flow can be steplessly adjusted in the range of 0-100%, which is used to transport liquids (especially corrosive liquids). Metering pumps are also called quantitative pumps or proportional pumps.

Metering pumps are reciprocating positive displacement pumps, which are used for accurate metering. Usually, the stability accuracy of the metering pump is required to not exceed ±1%. With the continuous development of modern industry towards automatic operation and remote automatic control, the advantages of strong matching of metering pumps and wide range of media (liquids) are particularly outstanding.

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There are many different types of devices called compressors and pumps. In general, pumps move fluid while compressors create pressure. Pumps are usually associated with liquids while compressors are associated with gasses. In the end it is just language, and there are plenty of examples contradicting both those rules of thumb.