Quick and safe. The Navyline hose pump (shaking pump) is appropriate for decanting water, fuel, detergents and some chemicals. No sucking in is necessary, because the swallowing of unpleasant smelling and tasting fluids will be avoided. * How it works: 1. Hanging in the suction head in the higher fluid level, hold the other hose end into a lower box. 2. Quickly move the suction head up and down several times. 3. The fluid begins flowing through the hose automatically.