Going back to the original process post, I did not note a mention of this "IP" lock tool when R&R'ing the Vacuum Pump. Can you elaborate?

TIA!

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"Opportunity is missed by most people because it is dressed in overalls and looks like work" - Thomas Edison-
1979 300SD
1975 450SL
2014 Ram Cummins Megacab (tow rig)