Paul L Evanston , IL January 18, 2022 Appliance: Bosch Refrigerator B21CL81SNS/01 Bosch Refrigerator B21cl81sns/01: Replace door flap on Bosch refrigerator. How to replace Condensation Separator. Removed existing door flap and replaced with part from ApplicancePartsPros.com.. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes