The rubber grommet seals and holds the windshield washer pump in place inside the washer reservoir. To remove it, begin by disconnecting its electrical connector. The wiper fluid container should be emptied or a drain pan used to collect any liquid that might be lost when the pump is taken off. If you are taking out the pump from the reservoir ensure that you take it out with caution so as not to damage the sealant grommet. Before you go ahead and install it back, examine carefully its sealing grommet made of rubber and if it has any cracks, brittleness or damage replace it outrightly. Finally lubricate this rubber grommet using washing fluid or even mild liquid soap product. Press both pick up and pump assembly into the reservoir ensuring they are fully seated. Lastly refill your reservoir then check for leaks of fluid on normal operation.