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I was adding a Lucca flow control unit from Clive (pretty nice) and I noticed that the group supply valve washer topside of the E61 group was deteriorating and leaving bits of rubber in the group. Profitec owners might want to check that out. My Pro 500 is 3 1/2 years old. BREWING GROUP VALVE "RUBBER" GASKET TYPE E61 - Ø 13x4x4mm. Part # 519545. Here is a drawing: https://sproparts.com/en/draw/1652