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New group head seal, compound or silicone?

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  • #16
    I recently saw sticky blue Cafelat seals in a commercial machine. I put them in 3 months ago. Swapped them out as per the baristas request even though they were still soft and sealing well.

    I still have them and when i remember I'll soak them in Cafetto to see if it's just coffee oils doing it or a degradation of the seal.

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    • #17
      Yep, it will be the coffee oils for sure...
      Used to soak mine in Cafetto about once every six months but weekly backflushing with sufficient Cafetto prevented the accessible surface from getting sticky. (Using the jiggle and 'sneeze' manoeuvrer )

      Mal.

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