Europiccola and Professionale, Stradivari, Esperto, etc. etc.
Note: To remove the retaining ring that hold this gasket in place, you will need a pair of “snap ring pliers,” such as this item on Amazon: http://amzn.to/20zpEbc
Proper installation is with the flat part facing up toward the lever connection and the groove facing down toward the brass washer and spring clip.
