Milwaukee cordless transfer pumps for moving water without a generator or a drop cord.
The stick pumps drop straight into a tank, a sump or a standing puddle and pump through a garden hose — the usual job is draining a water heater or a boiler on a service call. The M18 inline transfer pump runs from a hose on both ends for higher flow when there is somewhere to sit it.
None of these are potable-rated or continuous-duty; they are service tools for moving water once and moving on.
