📹 Bezzera BZ13 PM, BZ13 DE and Magica PID: Clean or Replace the Vacuum Relief Valve Updated September 22, 2022 13:05 Learn how to clean or replace the vacuum relief valve in Bezzera BZ13 PM, BZ13 DE, and Magica PID espresso machines. Bezzera BZ13: How to Clean or Replace the Vacuum Relief Valve Related Content Bezzera BZ13: Remove and Install Housing