La Marzocco 6mm Flat Group Gasket.
This is the older style La Marzocco group gasket that measures about 6mm on the outer and 6mm on the inner edge.
When installing this gasket into your group head, keep a close eye on the outer edge- one side will be slightly rounded, one will be quite sharp. The rounded edge should be inserted into the group as it is put there to help ease the gasket in. No grease should be necessary when installing a group gasket.
When it's time to replace the gasket in your machine, a scratch awl is the tool for the job. Remove the screen, push the pointed end of the awl into the gasket and pry it out against the side of your group. It should pop out fairly easily if the group gasket hasn't gotten hard.
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This is an OEM part.