Gary K Mesa , AZ December 10, 2022 Appliance: Amana Dishwasher ADB1200AWB Amana Dishwasher Adb1200awb: Dishwasher would not pump out. How to replace Flapper, Drain Pump. We replaced the check valve aka Drain Pump Flapper. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes