Mity Vac Fluid Evactuator Pump ExtractorAt the push of a button, this versatile unit changes from vacuum to pressure for evacuating or dispensing fluids. This functionality makes it ideal for draining tanks or reservoirs then pumping the used fluid back out for easy disposal. Multiple units work great, simply evacuate used fluids with one unit, and then quickly refill with new fluid from a second. Features: Evacuates or dispenses at the push of a button Convenient manual pump operation