Tunze 6025 problem

It prevents the plastic pieces of the drive unit and disk 6025.74 from wearing out. Over time sand and grit accumulates and they sand each other down unless the SS disk is in place.
 
They are probably 1cm in diameter with a hole in the middle that is just the size of the shaft. They did not come with pumps made before June.
 
Roger, just wanted to check to make sure you guys received my 6025.

Thanks for the help!

Tony in Clifton, NJ
 
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