√ Alternate part numbers include AP5331254 and PS4222545. √ Prevents drain water from flowing back into the pump sump. You may need to replace your check valve if: the dishes are not being cleaned properly if the dishwasher does not drain, if the dishwasher is leaking water, or if the dishwasher will not run at all. √ It is important to disconnect your appliance from the power and water supply before servicing. Face the beveled side inward as you install the new check valve. √ Supplying Demand replacement parts are compatible with Major Brands, but you should always verify fitment with your specific model. We have included a video in the product gallery to help you find your model number and information in the description below.