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Buy a replacement gasket for your Wega, Expobar or Rocket espresso machine. While this gasket is intended for a Wega machine, those machines share the E61 group head with the Expobar and Rocket equivalents, so it should fit in any one of those machines!
Gaskets generally need to be replaced when they wear out. You'll know it's time to replace your group head gasket when you see any leaking from the group head while brewing.