A few other things have to be taken care of when it is time to store the sprayer. Add 1 to 5 gallons of light weight oil, depending on the size of the tank, to the rinsing water before the final flushing. As water is pumped from the sprayer, the oil leaves a protective coating inside the tank, pump, hoses, and other parts. To prevent corrosion, remove nozzle tips and strainers, dry them, and store them in a an of light oil such as diesel fuel or kerosene. Drain all cleaning water from all part to prevent freezing.
Pumps require special care.
After draining the water, add a small amount of oil, and rotate the pump fur or five revolutions by hand to completely coat interior surfaces. Check the operator's manual. If oil is not recommended, pouring one tablespoon of radiator rust inhibitor in the inlet and outlet part of the pump also keeps the pump from corroding. Another alternative is to put automotive antifreeze with rust inhibitor in the pump and other sprayer parts. This also protects against corrosion and prevents freezing in case all the water is not drained.