Vortex 12 Volt Purging and Sampling Pumps, (ES-40 or ES-60), may be slowed down to decrease flow at the wellhead. The box pictured above is simply attached to the car battery and the pump is attached to the post on the box. Water flow is increased or decreased by turning the dial on the box. This control box will operate with Whale pumps as well, one or two stage.
